Fresh install of Xubuntu 20.04.1 (on a HP Probook 430 G6), I shortly see the following error message flashing before grub's loading:
The system boots fine, but this error wasn't shown running Xubuntu 18.04 on that notebook.error: can't find command hwmatch
Also I like having no errors/warnings shown - unless something is really wrong.
Seems to be a known issue (#1840560) with no real fix - but a workaround.
Quoting a user comment from that issue page:
I suggest adding this line to the /etc/default/grub:
So the problematic if-then statement is not reached at all.
Don't forget executing "sudo update-grub" afterwards.
However, its still just another workaround...
Indeed that works to avoid that error message.