Thank to all for the comments. the problem ocures as well in guest-installation. my host is ubuntu 20.04 LTS - i switched to Kernel 5.4 in grub. one Guest is ubuntu 20.04 LTS - the autoupdate killed the virtualbox guest drivers / additions.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899233 Title: post login - no apps launched - virtualbox-dkms 6.1.10-dfsg-1~ubuntu1.20.04.1: virtualbox kernel module failed to build To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1899233/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs