[Bug 2137101] [NEW] Latest installer crashes if a disk is mounted

[walt white]

Public bug reported:

Expected behavior: The installer should detect that a target
disk/partition is busy or mounted. It should either automatically
unmount the LUKS volume or prompt the user to unmount it before
proceeding to disk operations.

Actual behavior: The installer crashes at the end of the process. It
appears it fails to unmount the manually mounted LUKS container, causing
the operation to fail silently or with a generic crash window. The
installation remains incomplete.

System info:

OS Version: Ubuntu 24.04.3 LTS

Installer Backend: Subiquity

Status: A LUKS volume was manually mounted in the live session during
install. *That was the target installation disk*

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

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https://bugs.launchpad.net/bugs/2137101

Title:
  Latest installer crashes if a disk is mounted

Status in apport package in Ubuntu:
  New

Bug description:
  Expected behavior: The installer should detect that a target
  disk/partition is busy or mounted. It should either automatically
  unmount the LUKS volume or prompt the user to unmount it before
  proceeding to disk operations.

  Actual behavior: The installer crashes at the end of the process. It
  appears it fails to unmount the manually mounted LUKS container,
  causing the operation to fail silently or with a generic crash window.
  The installation remains incomplete.

  System info:

  OS Version: Ubuntu 24.04.3 LTS

  Installer Backend: Subiquity

  Status: A LUKS volume was manually mounted in the live session during
  install. *That was the target installation disk*

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