So I just upgraded to 20.04 today and after it finished I got stuck on thus dev/sda2:clean, 426290/9740288 files, 28151635/38941184 blocks
After browsing the web for a while I found a fix that purged the nvidia driver. This one doesn't work for me since I use AMD. I couldn't find any other fixes. When trying to apt update it tells me that I can't install gnome-tweaks because it depends on packages, which again depend on packages etc.
