[Bug 1155216] Re: Unable to umount isodevice

[oldfred]

Same error with 20.04

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https://bugs.launchpad.net/bugs/1155216

Title:
  Unable to umount isodevice

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  When installing from an iso file, with grub's loopback option,
  Ubiquity displays a message stating the isodevice cannot be unmounted,
  even when the isofile is not located on the same harddrive as the
  installation target.

  sudo umount -l -r -f /isodevice

  solves this problem, so Ubiquity should be able to issue this command
  by itself, without any user action.

  Arbiel

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