First I did an upgrade from Xubuntu 18.04 to 20.04, and sound disappeared. I solved it by googling and then typing "sudo alsa force-reload" every time I started up my computer!
Then I did a clean installation with Xubuntu 20.04, and sound worked like normal.
The partitioning tool still needs some work. If you choose to let Ubuntu partition the drive, you can select LUKS encryption, but you can't choose the size of your swap partition. A tiny swap partition is created automatically (1 GB swap on my 8 GB RAM system). I had to google for some time before I realised I could create a swap file manually after installation.
If, on the other hand, you do manual partitioning, the installer automatically creates an ext4 partition inside your LUKS partition. There's no way to create a swap partition inside the same LUKS partition.
This is far too complicated for the casual user who just wants to encrypt their whole drive! For example, hibernation doesn't work if your swap isn't at least as big as your RAM.
Selecting proprietary drivers for my nVidia card during install, caused the installer to exit with an error message later on. Fortunately, I could easily switch to proprietary drivers after install.
Ubuntu is an incredibly powerful system, but there are still a lot of bugs and kinks to straighten out.
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