Got this message today after updating grub on PureOS Crimson 11.
Notices:
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Warning: os-prober will not be executed to detect other bootable partitions.
My existing settings are
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=5
What does Purism recommend these settings be changed to in order to make nag message go away?
Do you have the file /etc/default/grub.ucf-dist ?
Personally I don’t use “hidden”. Instead I have GRUB_TIMEOUT_STYLE=menu and the only reason that I can see to avoid that would be with non-technical users who would be confused or who would stuff it up (which I guess would include some kind of kiosk environment).
So probably
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=5
The file noted above recommends using info -f grub -n 'Simple configuration' for documentation on available options.
By the way, none of the above is a Purism recommendation. I don’t speak for Purism. These are just my personal observations.
I do have that file.
I ended up changing the setting GRUB_TIMEOUT=0 and the error went away.
Not sure how the original settings got there, probably left over from Byzantium.
Thanks for the suggestion though.