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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Dan Bungert (dbungert):

[Impact]

 * Users cannot trivially skip the media integrity test in
   the 20.04.x installer, as ctrl-c is no longer available
   and the option 'fsck.mode=skip' is NOT honored if it is
   last in cmdline (which is usually the case for humans).

 * The impact is more severe on physical server installs,
   where usually the speed of _virtual_ optical media w/
   the BMC is really slow; impacting field/data center ops.

[Test Plan]

 * Run casper in a container/guest with fake /proc/cmdline
   in 3 modes for 'fsck.mode=skip': (steps in comment #39).

   1) not present
   2) present, last option
   3) present, not last option

 * Test the options with 20.04.5 release candidate images.

[Where problems could occur]

 * The patch is restricted to the option parsing in casper,
   so regressions would likely manifest as errors parsing
   kernel cmdline options or crashing casper (systemd unit).

 * The patch has been in Jammy/22.04 from the daily builds.

[Original 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.

** Affects: subiquity
     Importance: Medium
         Status: Triaged

** Affects: ubuntu-release-notes
     Importance: Undecided
         Status: New

** Affects: casper (Ubuntu)
     Importance: Medium
     Assignee: Mauricio Faria de Oliveira (mfo)
         Status: Fix Released

** Affects: casper (Ubuntu Focal)
     Importance: Medium
     Assignee: Mauricio Faria de Oliveira (mfo)
         Status: Fix Released

** Affects: casper (Ubuntu Jammy)
     Importance: Medium
     Assignee: Mauricio Faria de Oliveira (mfo)
         Status: Fix Released


** Tags: fr-2136 verification-done-focal verification-needed
-- 
Impossible to skip integrity test for ubuntu-server 20.04.1 iso
https://bugs.launchpad.net/bugs/1892369
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