[Bug 2084032] Re: pc-kernel umount failure

[corrado venturini]

Same problem installing from Ubuntu 25.04 "Plucky Puffin" - Daily amd64 (20241201)
I had the problem twice with the same usb pen, the third time, waiting for the activity on the disk to finish, the installation completed well.

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https://bugs.launchpad.net/bugs/2084032

Title:
  pc-kernel umount failure

Status in subiquity:
  In Progress
Status in ubuntu-desktop-provision:
  Triaged
Status in subiquity package in Ubuntu:
  Confirmed

Bug description:
  Doing some install tests with the Oracular October 8 ISO, I had an
  installer crash.

  I booted with a live system and proceed to wipe the internal SSD hard
  disk using `blkdiscard -f /dev/sda` (this disk is quite old, so it's
  recognized as a SATA one, not as a NVME). After that, I completely
  shut down the computer, and booted the Oracular Desktop LiveCD using
  an USB stick created with the October, 8 ISO. I chose "Spanish" and
  "Spanish keyboard", no `accessibility` options, connected to my WiFi
  (no Ethernet available in the laptop), clicked next, next, chose
  `extended selection` to install "all the stuff", clicked next, marked
  both `Install third party software for graphics and WiFi hardware` and
  `Download and install support for additional media formats`, and when
  I press the `Next` button, the installer crashed.

  I attach the contents of the `/var/log` folder.

  I also checked the first 400KBytes of the hard disk, and it's all
  zeros. No data there, as expected after a `blkdiscard`.

  The laptop is an Asus Zenbook UX21E from 2012, with 4GBytes of RAM,
  with an Intel Core i5-2467M CPU.

  The bug can be consistently reproduced after using `blkdiscard`. But
  if the disk has partitions, it doesn't seem to fail.

  I didn't test with other languages. Also, didn't test using `normal
  selection` or not marking `third party drivers` or `additional media
  format`. Only tested that specific combination.

  No FDE/TPM install is being done (the laptop is too old for that).

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