I'm having the same issue. Both host and guest are 20.04 and Virtualbox 6.1.10 packages from Ubuntu repo. I'm not able to change the guest's resolution *at all,* which makes it unusable for anything with a GUI because nothing written in the last 10 years gracefully downgrades to 800x600. I've tried different display drivers, 3D on/off, more RAM.
Thanks to #4 I found a work around at https://www.virtualbox.org/ticket/19496#comment:32. Running `VBoxClient --vmsvga` in the guest allows the display to by dynamically resized. Unfortunately, it does not survive guest reboot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1873922 Title: 20.04 not compatible with virtualbox-guest-x11: Fails changing display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1873922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
