sddm silently fails to open login screen if no good OpenGL

[Evgeniy Permyakov]

After updating my system (ubuntu 20.04) I ended in situation with sddm running, but without displaying login screen. Manually starting X in a tty2 let me google for the issue and find old ticket about sddm behaving bad if no valid opengl implementation available. Quick check with glxinfo showed that SGI implementation was used instead of NVIDIA one. After dist-upgrade kernel image and modules were rebuilt and sddm started normally.

I understand that in this case sddm failed to start due to unfortunate circumstances resulting in invalid system state. However, in this state it is not possible for inexperienced users to google for the problem. Please, consider at least better diagnostics for the situation until upstream fixes the issue. Spoiler: the original ticket is from 2017 https://github.com/sddm/sddm/issues/799

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1896775/+editstatus and add the package name in the text box next to the word Package.

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