it turned out virtual-box-guest-dkms was not installed at all (I formerly did apt install virtualbox-guest-x11 to install the guest utilities; are there any dependencies missing?)
after apt install virtual-box-guest-dkms I got an error message (in the terminal): module 5.0.16_ubuntu for vboxvideo.ko is not newer than what is already found in kernel 4.4.0-18-generic. You may override by specifiying --force. --- I now tried dpkg-reconfigure virtualbox-guest-dkms --force same error again; I don't know for which command I should use --force --- I finally tried: dkms build -m virtualbox-guest -v 5.0.16 Module virtualbox-guest/5.0.16 already built for kernel 4.4.0-18-generic/4 dkms install -m virtualbox-guest -v 5.0.16 Module virtualbox-guest/5.0.16 already installed on kernel 4.4.0-18-generic/x86_64 --- after a reboot, the problem persists (as expected) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1572001 Title: Virtualbox-guest-x11 no longer working in Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1572001/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
