The original report text confirms that "The exit code is 0, so update-grub does not fail as a result." That matches my understanding (as someone who has done a lot of ZFS installs maintaining the upstream Root-on-ZFS HOWTO) that this is purely cosmetic.
If you're not actually running other operating systems, you can simply remove the os-prober package to make the errors go away.
I'm not saying it shouldn't be fixed. But it's not actually breaking your systems, right?
brian-willoughby (and pranav.bhattarai):
The original report text confirms that "The exit code is 0, so update-grub does not fail as a result." That matches my understanding (as someone who has done a lot of ZFS installs maintaining the upstream Root-on-ZFS HOWTO) that this is purely cosmetic.
If you're not actually running other operating systems, you can simply remove the os-prober package to make the errors go away.
I'm not saying it shouldn't be fixed. But it's not actually breaking your systems, right?