Virtualbox Dark Theme and Slow Install
If running a dark theme Virtualbox doesn't respond to it and can be a little hard to read, a simple change in QT settings helps. Installing Linux Mint, Ubuntu and some other distro's takes much longer, about 25 minutes compared to about 6-7 minutes on my old 18.1 system. Same hardware just the newer 20.1 Mint and 6.1 VB, don't know why. Manjaro Mate only took the usual 6-7 minutes!