[Bug 2073751] Re: 50mounted-tests prevents os-prober to work with ThinLVM

[Guillaume]

*** This bug is a duplicate of bug 1987679 ***
    https://bugs.launchpad.net/bugs/1987679

FYI, this bug concerns Ubuntu 20.04 to 24.04.

** Tags added: focal jammy noble

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https://bugs.launchpad.net/bugs/2073751

Title:
  50mounted-tests prevents os-prober to work with ThinLVM

Status in os-prober package in Ubuntu:
  New

Bug description:
  No os-prober entries are added to grub.cfg for alternates systems on
  ThinLVM, because of an issue with /usr/lib/linux-boot-
  probes/50mounted-tests.

  Updating line 55 from :
      type="$(grub-probe -d "$partition" -t fs)"
  to
      type="$(grub-probe -d "$partition" -t fs || echo bad)"
  fixes the issue.

  Credit is due to mikeaa on bug #1987679.

  Tested on Ubuntu 24.04.

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