I wanted to install Ubuntu Budgie 21.10 in VirtualBox 6.1 on Linux Mint 20.2.
Unfortunately, a part of the installer is cut off in the right and lower area. The area with the crucial buttons to perform the installation. See screenshot here.
With these problems, the installation of Ubuntu Budgie will be a tedious test of patience.
As my crosspost in the VirtualBox forum revealed, I am not the only user with this problem.