[Bug 1721633] [NEW] os-prober needs a check for subvolumes on btrfs formatted root partitions

[bcowan]

Public bug reported:

os-prober will not find other ubuntu installs when their root partitons
are created by ubiquity.  Ubuntu creates subvolumes with the @ for root
and @home.  os-prober needs to check inside the @ subvolume or there
needs to be a symlink to @/boot @/etc which is hackish/not sane
otherwise the other already installed ubuntu versions get overwritten or
not seen in the grub menu.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 17.10 and artful budgie on regular ubuntu

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https://bugs.launchpad.net/bugs/1721633

Title:
  os-prober needs a check for subvolumes on btrfs formatted root
  partitions

Status in grub2 package in Ubuntu:
  New

Bug description:
  os-prober will not find other ubuntu installs when their root
  partitons are created by ubiquity.  Ubuntu creates subvolumes with the
  @ for root and @home.  os-prober needs to check inside the @ subvolume
  or there needs to be a symlink to @/boot @/etc which is hackish/not
  sane otherwise the other already installed ubuntu versions get
  overwritten or not seen in the grub menu.

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