Ubuntu
os-prober package

  1. Bug #1987679
  2. Comment #0

Comment 0 for bug 1987679

Revision history for this message
mike (mikeaa) wrote : update-grub leaves filesystems (lvm-thin, lvm snap) mounted

If on happens to have by accident (or on purpose) a thick LVM snapshot, or a thin-LV with a copy of a system on it, grub-install reports
/sbin/grub-probe: error: unknown filesystem.
Found Ubuntu 22.04.1 LTS on /dev/mapper/vgxubuntu-s22.04
and
/sbin/grub-probe: error: disk `lvmid/X7waXv-rMDA-5fQA-aw6l-ei1I-8Gz3-pQl3lr/k3Ze1u-Mfwc-pxUt-7fXa-FjSZ-7IkX-HAxf3b' not found.
Found Ubuntu 22.04.1 LTS (22.04) on /dev/mapper/vgxubuntu-XR22.04.1U

and leaves the systems mounted rw on /var/lib/os-prober/mount.
On subsequent invocations it spews out multipler
mdir: failed to remove '/var/lib/os-prober/mount': Device or resource busy

I'm pretty sure this also causes a new install to hang (though a power-reset seems to load the new system - not sure if it is complete or not.)

The missing umounts should be relatively easy to fix, but the thick snapshot error is particularly vague as most users (I think) would take the "unknown filesystem" to refer to the previous entry.

I have been playing with grub2-common-2.06-2ubuntu7 on xubuntu 22.04.1, though I am sure this has been around a while