Public bug reported: Ubuntu Cinnamon 20.10 does not install nor update the Linux headers, that are required for the Virtualbox Guest Additions. The upgrade from Linux 5.8.0-18 to 5.8.0-19 went wrong after reboot, because the screen was using the default 800 x 600. It was not possible to update to my standard 1920 x 1080, because it was missing from the list of supported resolutions, so I compromised on 1680 x 1050.
I used Synaptic again to reinstall the Linux headers and after that the installation of Virtualbox Guest Additions went as as expected and everything was OK. Ubuntu itself does NOT have this problem, it is specific for Cinnamon. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: virtualbox (not installed) ProcVersionSignature: Ubuntu 5.8.0-19.20-generic 5.8.8 Uname: Linux 5.8.0-19-generic x86_64 ApportVersion: 2.20.11-0ubuntu47 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: X-Cinnamon Date: Thu Sep 24 22:07:18 2020 InstallationDate: Installed on 2020-09-15 (9 days ago) InstallationMedia: ubuntucinnamonremix "@BASECODENAME" (20200904) SourcePackage: virtualbox UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: virtualbox (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug groovy -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1897198 Title: Ubuntu Cinnamon 20.10 Linux headers not installed nor updated To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1897198/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs