Hi!
I'm pleased with UM 20.04 and it's all fine here except a weird annoying GRUB menu bug I'm hitting:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1836934?comments=all
Basically, GRUB menu remains hidden regardless of any GRUB_TIMEOUT and GRUB_TIMEOUT_STYLE settings, which don't apply (obviously I'm running update-grub each time).
Thing is that at boot I CAN navigate through menu items, since they ARE actually there and the system starts up accordingly, but they won't just show up no matter what keys you press or what you do: the screen stays black and I have to navigate blindly through the menu!