Thanks for your report! Since you use lightdm 1.30.0-0ubuntu4~20.04.1 from focal-proposed, can you please downgrade to version 1.30.0-0ubuntu3.1 and let us know if it makes a difference.
** Changed in: lightdm (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1926686 Title: lightdm segfaults Status in lightdm package in Ubuntu: Incomplete Bug description: [510606.379044] lightdm[4046529]: segfault at 55007d2a3f8b ip 00007f7260003f0b sp 00007fffbb5a0600 error 4 in libc-2.31.so[7f725ff8e000+178000] ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: lightdm 1.30.0-0ubuntu4~20.04.1 Uname: Linux 5.10.32 x86_64 ApportVersion: 2.20.11-0ubuntu27.17 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: MATE Date: Thu Apr 29 20:55:18 2021 SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1926686/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp