Comment 23 for bug 1940723

As far as we know these issue are all caused by the install_devices debconf entry becoming invalid due to hardware configuration changes, and then a subsequent upgrade in non-interactive mode failing due to this.

Interactive upgrade or re-installation will simply prompt to specify the new install device path.

A solution to make this nicer in the future is to use UUID based install_devices tracking, but I consider this a new a feature instead, and lowering priority to Medium