I've observed the same problem many times. It's a problem with the open source nouveau driver for Nvidia cards, as Andreas points out. Unfortunately I've had poor experiences with this driver on two different machines, and it's both difficult to debug and apparently low priority in the Linux world.
On Tue, 10 Dec 2019, 04:38 Andreas Perstinger, <andiper...@gmail.com> wrote: > On 08.12.19 11:15, vi...@calday.co.uk wrote: > > My problem is that Ubuntu crashes very often on Ubuntu 18.04 - so I ran > it > > using the terminal, so that I could try to debug it. I got error messages > > straight away (there's a lot here): > > > > libpng warning: iCCP: known incorrect sRGB profile > > libpng warning: iCCP: known incorrect sRGB profile > > libpng warning: iCCP: known incorrect sRGB profile > > libpng warning: iCCP: known incorrect sRGB profile > > libpng warning: iCCP: known incorrect sRGB profile > > QIODevice::write (QProcess): device not open > > QIODevice::write (QProcess): device not open > > nouveau: kernel rejected pushbuf: Invalid argument > ^^^^^^^ > > It looks like you have a NVIDIA graphics card and I've found several > reports on the internet describing problems with the open source graphic > driver nouveau and QT. > > One workaround may be setting an environment variable before starting the > application: > > QT_XCB_FORCE_SOFTWARE_OPENGL=1 mnemosyne > > You could also try to use the proprietary nvidia driver for your graphics > card. > > Bye, Andreas > > -- > You received this message because you are subscribed to the Google Groups > "mnemosyne-proj-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to mnemosyne-proj-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/mnemosyne-proj-users/3b494238-e459-2d40-c22e-53fba692762d%40gmail.com > . > -- You received this message because you are subscribed to the Google Groups "mnemosyne-proj-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to mnemosyne-proj-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/mnemosyne-proj-users/CAO-0pXAygO%3DLemDzq-z6Mhw5_OF%2Bb1NY5XgvyPnF3qoL8--g1w%40mail.gmail.com.
