Thank you gwel! With your message I realized I did not have VirtualBox installed from the expected source because I installed "virtualbox" instead of "virtualbox-6.1":
$ apt-cache policy virtualbox virtualbox: Installed: 6.1.10-dfsg-1~ubuntu1.20.04.1 Candidate: 6.1.10-dfsg-1~ubuntu1.20.04.1 Version table: *** 6.1.10-dfsg-1~ubuntu1.20.04.1 500 500 http://ar.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages 100 /var/lib/dpkg/status 6.1.6-dfsg-1 500 500 http://ar.archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages $ apt-cache policy virtualbox-6.1 virtualbox-6.1: Installed: (none) Candidate: 6.1.16-140961~Ubuntu~eoan Version table: 6.1.16-140961~Ubuntu~eoan 500 500 https://download.virtualbox.org/virtualbox/debian focal/contrib amd64 Packages So Ubuntu's own repo needs update probably as you mention. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1910412 Title: virtualbox-dkms 6.1.10-dfsg-1~ubuntu1.20.04.1: virtualbox kernel module failed to build when running dist-upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1910412/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs