[Bug 1892369] Re: Impossible to skip integrity test for ubuntu-server 20.04.1 iso

[Mauricio Faria de Oliveira]

Issues reproducible with ubuntu-20.04.4-live-server-amd64.iso.

Apparently, ctrl-c does not stop the integrity check anymore
because casper-md5check runs as systemd service/disconnected
from plymouth. Per [1], iiuic. -- Well, this is _not_ a bug.

So, fsck.mode=skip is the only option available.

However, there's a bug in casper-md5check that ignores that
_if_ it is the last option in /proc/cmdline (likely, if the
user adds it after '---' or deletes '---' to insert it.)

Workaround: make sure to add fsck.mode=skip before '---'.

Patch proposed [2], with technical details and testing.

[1] https://launchpad.net/ubuntu/+source/casper/1.457
[2] https://code.launchpad.net/~mfo/casper/+git/casper/+merge/417120

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https://bugs.launchpad.net/bugs/1892369

Title:
  Impossible to skip integrity test for ubuntu-server 20.04.1 iso

Status in subiquity:
  Fix Released
Status in casper package in Ubuntu:
  In Progress

Bug description:
  It is not possible to skip the integrity test with the iso available
  at http://www.releases.ubuntu.com/20.04/ubuntu-20.04.1-live-server-
  amd64.iso .

  Bellow is a screenshot of me hitting CTRL+C to try to cancel it, without success:
  https://ibb.co/vwvtXmn

  Checking integrity can be extremely slow when mounting an image via
  virtual CD tools from Dell idrac. I didn't measure it precisely but it
  takes more than 30 minutes.

  Since the image is on a remote location and was already checked, this
  is completely useless.

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