[Bug 1491963] Re: preseeding for partman/installation_medium_mounted fails because 'seen' is forced to false

[Neil Roza]

I can demonstrate that

    https://cdimage.ubuntu.com/ubuntu-legacy-
server/releases/focal/release/ubuntu-20.04.1-legacy-server-amd64.iso

is affected. The installer prompts with

> Your installation medium is on /dev/sdb. You will not be able to create,
> delete, or resize partitions on this disk, but you may be able to install
> to existing partitions there.

If I preseed

    d-i partman/filter_mounted boolean false

then the prompt is silenced.

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https://bugs.launchpad.net/bugs/1491963

Title:
  preseeding for partman/installation_medium_mounted fails because
  'seen' is forced to false

Status in partman-base package in Ubuntu:
  Confirmed

Bug description:
  partman/init.d/30parted always forces 'seen' to 'false' for
  partman/installation_medium_mounted. This prevents it from being
  preseeded, as Colin suggests in
  https://bugs.launchpad.net/ubuntu/+source/partman-base/+bug/344976.

  --
  		if [ "$part_warn" ]; then
  			db_subst partman/installation_medium_mounted PARTITION "$part_warn"
  			db_fset partman/installation_medium_mounted seen false
  			db_capb align
  			db_input high partman/installation_medium_mounted || true
  			db_go || true
  			db_capb backup align
  		fi
  --

  https://bugs.launchpad.net/ubuntu/+source/partman-base/+bug/1355845 is
  the same problem, but for partman/unmount_active.

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