Problem of graphics card after SAMSON installation on Ubuntu 18.04 (Intel processors)

DmitriyMarin

Thank you, @Robert

Could you, please, try these commands and see if it shows you anything:

ldd /usr/lib/x86_64-linux-gnu/libOpenGL.so

cd ~/NANO-D/SAMSON/0.7.0/Binaries
ldd ./SAMSON-Core | grep "not found" | grep -v "Qt5"
ldd ./libSBGRender.so | grep "not found" | grep -v "Qt5"

Here we check for dependencies which are not found excluding Qt5 because Qt5 might be included in the script launching SAMSON-Core.
If you see any output, please, post it here.

Robert

Thanks Dmitriy.

"ldd /usr/lib/x86_64-linux-gnu/libOpenGL.so" gives me :

linux-vdso.so.1 (0x00007ffc4cd2b000)
libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fda5d9e0000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fda5d5ef000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fda5d3eb000)
/lib64/ld-linux-x86-64.so.2 (0x00007fda5dec4000)

ldd ./SAMSON-Core | grep "not found" | grep -v "Qt5" gives me :

Finally, the command
ldd ./libSBGRender.so | grep "not found" | grep -v "Qt5"
gives me :

It does not seem encouraging as nothing is found ... !
Regards,
Robert

DmitriyMarin

Sorry, I should have added:

cd ~/NANO-D/SAMSON/0.7.0/Binaries
export LD_LIBRARY_PATH=.:./SAMSONQtLibs:$LD_LIBRARY_PATH

So, all these "not found" you posted are ok, since these libraries are actually provided with SAMSON and are placed in the same folder.
If you redo the ldd check it should not find any "not found" libraries.

Or you can do this ldd check from the SAMSON-Core.sh launching script after exporting all the libraries (already done in the script) instead of launching ./SAMSON-Core

We will see what might cause the issue, but might be it smth more general since you said the VMD does not work as well.

Robert

No problem. Indeed, I don't find any "not found" library anymore with the two ldd checks above :
ldd ./SAMSON-Core | grep "not found" | grep -v "Qt5"
ldd ./libSBGRender.so | grep "not found" | grep -v "Qt5"

When I launch SAMSON (./SAMSON-Core.sh or ./SAMSON-Core), I get the following message in the terminal :

"
saving context
launching SAMSON-Core
Python found in the system:
Python executable: /home/rbenda/anaconda3/bin/python3
Python library has not been loaded: Cannot load library libpython3.6m: (libpython3.6m: cannot open shared object file: No such file or directory)
"

I don't know if the problem can be due to this Python library but I don't think so (there might be a problem for SAMSON Apps using Python but it is not yet my case ...).

I have modified the SAMSON-Core.sh script with vi. I uncommented the two lines
ldd SAMSON-Core
echo $LD_LIBRARY_PATH

and added

ldd ./SAMSON-Core | grep "not found" | grep -v "Qt5"
ldd ./libSBGRender.so | grep "not found" | grep -v "Qt5"

just before the last line echo "restoring context".

SAMSON windows opens (as usual, but with the usual problem of no molecule appearing when loading a molecule, or the window not following the 'mouse' movement as you could see in the first screen shot I posted). I obtain this message in the terminal :

saving context
launching SAMSON-Core
Python found in the system:
Python executable: /home/rbenda/anaconda3/bin/python3
linux-vdso.so.1 (0x00007ffed5fd5000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fab6811d000)
libOpenGL.so.0 => /usr/lib/x86_64-linux-gnu/libOpenGL.so.0 (0x00007fab67eef000)
libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fab67cbe000)
libGLU.so.1 => /usr/lib/x86_64-linux-gnu/libGLU.so.1 (0x00007fab67a4f000)
libSAMSON.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSAMSON.so (0x00007fab67647000)
libSBGCommand.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGCommand.so (0x00007fab6732e000)
libGUI.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libGUI.so (0x00007fab67000000)
libSBGUser.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGUser.so (0x00007fab66de2000)
libSBSNeighborSearch.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBSNeighborSearch.so (0x00007fab66bba000)
libSBGMain.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGMain.so (0x00007fab66912000)
libSBGProperty.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGProperty.so (0x00007fab666ff000)
libSBGToolBar.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGToolBar.so (0x00007fab664e3000)
libSBGElement.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGElement.so (0x00007fab662ce000)
libSBGInspector.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGInspector.so (0x00007fab65cfb000)
libSBIFile.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBIFile.so (0x00007fab65af0000)
libSBGRender.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGRender.so (0x00007fab65830000)
libSBGDocument.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGDocument.so (0x00007fab655ce000)
libSBGUndo.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGUndo.so (0x00007fab653b9000)
libSBGWidget.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGWidget.so (0x00007fab65162000)
libSBIElement.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBIElement.so (0x00007fab64f13000)
libSBGNotification.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGNotification.so (0x00007fab64d06000)
libSBGLog.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGLog.so (0x00007fab64af4000)
libIO.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libIO.so (0x00007fab648f1000)
libSBIPackage.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBIPackage.so (0x00007fab646d1000)
libSBIWebService.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBIWebService.so (0x00007fab644b3000)
libSBGVisualModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGVisualModel.so (0x00007fab642a3000)
libSBGStructuralModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGStructuralModel.so (0x00007fab64037000)
libSBGPropertyModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGPropertyModel.so (0x00007fab63e27000)
libSBGInteractionModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGInteractionModel.so (0x00007fab63c16000)
libSBGDynamicalModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGDynamicalModel.so (0x00007fab63a05000)
libSBGSimulator.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGSimulator.so (0x00007fab637f5000)
libSBGStateUpdater.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGStateUpdater.so (0x00007fab635e8000)
libSBGDataGraph.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGDataGraph.so (0x00007fab6331c000)
libSBGMenu.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGMenu.so (0x00007fab6310e000)
libSBGAction.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGAction.so (0x00007fab62ee8000)
libSBGApp.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGApp.so (0x00007fab62cdd000)
libSBGEditor.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGEditor.so (0x00007fab62ac0000)
libSBGWindow.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGWindow.so (0x00007fab6286b000)
libSBGSettings.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGSettings.so (0x00007fab62652000)
libData.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libData.so (0x00007fab61b9e000)
libSBDColor.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDColor.so (0x00007fab61854000)
libSBDDocument.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDDocument.so (0x00007fab6130b000)
libSBMVisualModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMVisualModel.so (0x00007fab610fa000)
libSBDController.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDController.so (0x00007fab60d80000)
libSBMPropertyModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMPropertyModel.so (0x00007fab60b6f000)
libSBSSimulator.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBSSimulator.so (0x00007fab60957000)
libSBDApp.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDApp.so (0x00007fab60743000)
libSBGPath.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBGPath.so (0x00007fab6052b000)
libQt5MultimediaWidgets.so.5 => ./SAMSONQtLibs/libQt5MultimediaWidgets.so.5 (0x00007fab6030d000)
libQt5Multimedia.so.5 => ./SAMSONQtLibs/libQt5Multimedia.so.5 (0x00007fab60002000)
libQt5Network.so.5 => ./SAMSONQtLibs/libQt5Network.so.5 (0x00007fab5fc6e000)
libQt5OpenGL.so.5 => ./SAMSONQtLibs/libQt5OpenGL.so.5 (0x00007fab5fa17000)
libQt5PrintSupport.so.5 => ./SAMSONQtLibs/libQt5PrintSupport.so.5 (0x00007fab5f7a9000)
libQt5Sql.so.5 => ./SAMSONQtLibs/libQt5Sql.so.5 (0x00007fab5f562000)
libQt5Widgets.so.5 => ./SAMSONQtLibs/libQt5Widgets.so.5 (0x00007fab5ed2d000)
libQt5Gui.so.5 => ./SAMSONQtLibs/libQt5Gui.so.5 (0x00007fab5e57d000)
libQt5Xml.so.5 => ./SAMSONQtLibs/libQt5Xml.so.5 (0x00007fab5e342000)
libQt5Core.so.5 => ./SAMSONQtLibs/libQt5Core.so.5 (0x00007fab5dc02000)
libSBSStateUpdater.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBSStateUpdater.so (0x00007fab5d9ee000)
libSBMInteractionModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMInteractionModel.so (0x00007fab5d7d6000)
libSBMDynamicalModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMDynamicalModel.so (0x00007fab5d58e000)
libSBMStructuralModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMStructuralModel.so (0x00007fab5cc31000)
libSBDType.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDType.so (0x00007fab5ca0f000)
libSBMElement.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMElement.so (0x00007fab5c7ed000)
libSBDQuantity.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDQuantity.so (0x00007fab5c5eb000)
libSBMModel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBMModel.so (0x00007fab5c3dc000)
libSBDDataGraph.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBDDataGraph.so (0x00007fab5c00b000)
libSBCFunctor.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCFunctor.so (0x00007fab5bdff000)
libCore.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libCore.so (0x00007fab5bbfb000)
libSBCKernel.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCKernel.so (0x00007fab5b9da000)
libSBCUndo.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCUndo.so (0x00007fab5b7c6000)
libSBCClass.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCClass.so (0x00007fab5b5a2000)
libSBCSignal.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCSignal.so (0x00007fab5b396000)
libSBCReference.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCReference.so (0x00007fab5b169000)
libSBCLog.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCLog.so (0x00007fab5af5b000)
libSBCMeta.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCMeta.so (0x00007fab5ad4a000)
libSBCContainer.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCContainer.so (0x00007fab5ab28000)
libSBCHeap.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCHeap.so (0x00007fab5a7e1000)
libSBCSerializer.so => /home/rbenda/NANO-D/SAMSON/0.7.0/Binaries/libSBCSerializer.so (0x00007fab5a477000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fab5a0d9000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fab59ce8000)
/lib64/ld-linux-x86-64.so.2 (0x00007fab68321000)
libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fab59a32000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fab596fa000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fab594db000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007fab5924f000)
libstdc++.so.6 => /home/rbenda/anaconda3/lib/libstdc++.so.6 (0x00007fab683ce000)
libgcc_s.so.1 => /home/rbenda/anaconda3/lib/libgcc_s.so.1 (0x00007fab683b9000)
libpulse-mainloop-glib.so.0 => /usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0 (0x00007fab5904a000)
libpulse.so.0 => /usr/lib/x86_64-linux-gnu/libpulse.so.0 (0x00007fab58dfa000)
libglib-2.0.so.0 => /home/rbenda/anaconda3/lib/libglib-2.0.so.0 (0x00007fab58cdd000)
libz.so.1 => /home/rbenda/anaconda3/lib/libz.so.1 (0x00007fab6838f000)
libicui18n.so.56 => ./SAMSONQtLibs/libicui18n.so.56 (0x00007fab58844000)
libicuuc.so.56 => ./SAMSONQtLibs/libicuuc.so.56 (0x00007fab5848c000)
libicudata.so.56 => ./SAMSONQtLibs/libicudata.so.56 (0x00007fab56aa9000)
libgthread-2.0.so.0 => /home/rbenda/anaconda3/lib/libgthread-2.0.so.0 (0x00007fab6838a000)
libxcb.so.1 => /home/rbenda/anaconda3/lib/libxcb.so.1 (0x00007fab56880000)
libpulsecommon-11.1.so => /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so (0x00007fab56602000)
libdbus-1.so.3 => /home/rbenda/anaconda3/lib/libdbus-1.so.3 (0x00007fab565ae000)
libpcre.so.1 => /home/rbenda/anaconda3/lib/./libpcre.so.1 (0x00007fab56566000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fab5635e000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fab5615a000)
libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fab55ed6000)
libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007fab55ccc000)
libsndfile.so.1 => /usr/lib/x86_64-linux-gnu/libsndfile.so.1 (0x00007fab55a53000)
libasyncns.so.0 => /usr/lib/x86_64-linux-gnu/libasyncns.so.0 (0x00007fab5584d000)
liblzma.so.5 => /home/rbenda/anaconda3/lib/liblzma.so.5 (0x00007fab55627000)
liblz4.so.1 => /home/rbenda/anaconda3/lib/liblz4.so.1 (0x00007fab55403000)
libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fab550e8000)
libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007fab54ece000)
libFLAC.so.8 => /usr/lib/x86_64-linux-gnu/libFLAC.so.8 (0x00007fab54c57000)
libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 (0x00007fab54a4e000)
libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007fab54823000)
libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007fab5457a000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fab5435f000)
libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fab5414a000)
/home/rbenda/NANO-D/SAMSON/0.7.0/Binaries:.:./SAMSONQtLibs:/home/rbenda/anaconda3/lib:
Python library has not been loaded: Cannot load library libpython3.6m: (libpython3.6m: cannot open shared object file: No such file or directory)

Do you think it is only due to this "libpython3.6m" library problem ?

Thank you very much for your help, sorry for all theses problems and disturbance...
Have a nice evening
Robert

DmitriyMarin

Thank you for posting the log, @Robert !

The fact that it cannot find Python:

Python found in the system:
Python executable: /home/rbenda/anaconda3/bin/python3
Python library has not been loaded: Cannot load library libpython3.6m: (libpython3.6m: cannot open shared object file: No such file or directory)

should not cause any problem when launching SAMSON, it is only used in the Python Scripting Element in SAMSON.

But there are other lines which might indicate an issue, e.g.:

libxcb.so.1 => /home/rbenda/anaconda3/lib/libxcb.so.1

Could you, please, try launching SAMSON with the following line commented in the ./SAMSON-Core.sh script:

export LD_LIBRARY_PATH=${PYTHON_LIBRARY_PATH}:${LD_LIBRARY_PATH}

such that libxcb.so and other libraries won't be used from the anaconda3 installation. If they are still used from there you might want to check your environment variables (see ~/.bashrc) and excluding the path to anaconda3 from there just for the try.

But, I do not think that might be causing an issue since I am using anaconda3 under Ubuntu 16.04 (I use Python in SAMSON) and I have the same linking.

Robert

Thanks Dmitriy !

Indeed, commenting this line in the SAMSON-Core.sh script yields :

libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f5750b03000)

instead in the terminal.

DmitriyMarin

@Robert

Does it help with the problem you have?

DmitriyMarin

@Robert

When you executed the glxinfo | grep OpenGL command in the terminal you got:

...
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.2.8
...
OpenGL version string: 3.0 Mesa 18.2.8

Whilst your system supports OpenGL 4.5 and SAMSON asks for OpenGL 3.2+ during the installation, in some cases, the Mesa driver might provide OpenGL 3.0 for better compatibility. You can specify the version you want using the MESA_GL_VERSION_OVERRIDE environment variable. This should force the correct version of OpenGL to be used. To check how it works, you might do in the terminal smth like this:

MESA_GL_VERSION_OVERRIDE=4.5 glxinfo | grep OpenGL

Could you, please, try setting this variable in the script that launches SAMSON-Core (please, try versions 3.2, 4.2, and 4.5):

MESA_GL_VERSION_OVERRIDE=4.5 ./SAMSON-Core

Robert

Hello Dmitryi, thanks for your help.

Having:
libxcb.so.1 => /usr/ lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f5750b03000)

(i.e. the fact that libxcb.so and other libraries are not used from the anaconda3 installation, when commenting the line
export LD_LIBRARY_PATH=${PYTHON_LIBRARY_PATH}:${LD_LIBRARY_PATH}
in SAMSON-Core.sh script)

didn't solve the graphical problem when launching ./SAMSON-Core.sh.

I have a strange problem since this morning, when I try to launch ./SAMSON-Core directly, instead of ./SAMSON-Core.sh (which "works", i.e. open the SAMSON window but with the graphical problem you know), I obtain an error message :

./SAMSON-Core: error while loading shared libraries: libSAMSON.so: cannot open shared object file: No such file or directory.

I did the two commands:
MESA_GL_VERSION_OVERRIDE=4.5 glxinfo | grep OpenGL

MESA_GL_VERSION_OVERRIDE=4.5 ./SAMSON-Core

but for the second one, I obtain an error message (be it for 4.5, 3.2 or 4.2) ; the same error message as when launching ./SAMSON-Core :

./SAMSON-Core: error while loading shared libraries: libSAMSON.so: cannot open shared object file: No such file or directory

Sorry for so much trouble, hoping to solve it today !( but I have access to another fixed computer where SAMSON works today, so I can also work while trying to solve this problem on my laptop).
Regards,
Robert

Robert

Concerning libSAMSON.so, it is strange because I have it in my directory /NANO-D/SAMSON/0.7.0/Binaries . (and I checked but I think I didn't change the SAMSON-Core.sh script after re-commenting all the lines, so ./SAMSON-Core should open the interface as before...)

DmitriyMarin

On Linux, the SAMSON-Core.sh script is necessary for launching the SAMSON-Core executable since it sets up paths to necessary libraries. That's why when launching just the SAMSON-Core executable you may have an error about missing libraries.

Could you, please, try modifying the SAMSON-Core.sh script as follows (with different OpenGL versions: 3.2, 4.2, and 4.5):

MESA_GL_VERSION_OVERRIDE=4.5 ./SAMSON-Core

Robert

Thank you, I tried with the three versions 3.2, 4.2 and 4.5 but it didn't work ...

I inserted the line
MESA_GL_VERSION_OVERRIDE=4.5 ./SAMSON-Core

just before the final line of ./SAMSON-Core.sh :
echo "restoring context"

(I don't know if it is the right place...)

DmitriyMarin

Does the following command in the terminal:

MESA_GL_VERSION_OVERRIDE=4.5 glxinfo | grep OpenGL

among other output show you (for your version of Mesa):

OpenGL version string: 4.5 Mesa 18.2.8

Basically, it should specify the version of OpenGL provided by Mesa.

In the SAMSON-Core.sh script you can try modifying it as follow (see the line with ./SAMSON-Core):

...
export LD_LIBRARY_PATH=$script_dir:.:./SAMSONQtLibs:$LD_LIBRARY_PATH

#ldd SAMSON-Core	#uncomment to have more information if SAMSON crashes
#echo $LD_LIBRARY_PATH	#uncomment to have more information if SAMSON crashes
MESA_GL_VERSION_OVERRIDE=4.5 ./SAMSON-Core --logconsole			#available flags --disablenetwork /--import /--logconsole /--logfile "file" /--logdefaultfile

export LD_LIBRARY_PATH=$SAVED_LD_LIBRARY_PATH
export LC_ALL=$SAVED_LC_ALL
echo "restoring context"

You can try modifying the OpenGL version to 3.2, 4.2, 4.5. Does it launch SAMSON and do you still have the same problem?

Robert

Yes, with :
MESA_GL_VERSION_OVERRIDE=4.5 glxinfo | grep OpenGL

I obtain :
OpenGL version string: 4.5 (Compatibility Profile) Mesa 18.2.8

I tried this modification you proposed in the ./SAMSON-Core.sh, at the right place, SAMSON launches but I have the same graphical problem be it for 3.2, 4.2 and 4.5 versions ... I get a lot of information in the terminal while SAMSON is launching, do you want me to paste it ? (it is a bit long ...)

Robert

In the end of the message when launching SAMSON, I obtain :
....

  -  "elementName" "Graphene Sheet Creator"
  -  "elementDeveloperID" "C682B30F-0D21-4CDB-B968-B72E225DDC8F"
  -  "elementID" "FF9BE415-C812-1C1A-CDBE-78896176B067"
  -  "elementVersion" "0.7.0"
  -  "checksumDebug" 0
  -  "checksumRelease" 0
  -  "elementDescription" ""
  -  "elementOS" ""
  -  "samsonVersion" "0.7.0"
  -  "forceUpdate" false
  -----------------------------------------------------------------------

=============================================================================

QPixmap::scaled: Pixmap is a null pixmap
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
"File"
"File"
"Edit"
"Edit"
"App"
QLayout: Attempting to add QLayout "" to SBGWidgetOnExit "", which already has a layout
restoring context

DmitriyMarin

No, there is no need to post the output, it has a lot of information because of the --logconsole flag.

We will try to see what we can do about this issue.

DmitriyMarin

@robert

This output is totally ok.

DmitriyMarin

@Robert

What you can also do, if you want to try, is to add a PPA with newer drivers (see this launchpad page) - it provides recently updated X and Mesa free graphics drivers for Intel, etc:

sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt-get update

Update with it and may try installing the following package:

sudo apt-get install xserver-xorg-video-intel

P.s.: if you install packages from this PPA and later want to update Ubuntu to a newer version it is recommended to remove these packages and PPA before upgrading (see this launchpad page).

Robert

Thanks for these ideas. I tried but it didn't work.
I still have the same problem.

I will maybe focus on my problem for VMD, as you say it is maybe more general than SAMSON, it is a global graphics problem maybe.
Or maybe I could try a complete new installation of SAMSON , don't know if it could rearrange things thanks to the last installed packages...

Thanks again, Robert

DmitriyMarin

@robert
You can try re-installing, but I do not think it will resolve the issue.

Solved Problem of graphics card after SAMSON installation on Ubuntu 18.04 (Intel processors)

In the end of the message when launching SAMSON, I obtain : ....

In the end of the message when launching SAMSON, I obtain :
....