Backport cancel static delta upgrade if USB flash drive is removed to v2021pre
For encrypted static delta upgrade, the upgrade task may not get errors when accessing the decrypted upgrade file after USB flash drive has been removed. This can prevent encrypted file to be locked, and loopback to be released.
Use force to unmount encrypted bundle.
Signed-off-by: Frédéric Danis frederic.danis@collabora.com