plymouth does not ask for LUKS password and does not change tty properly

[Matthew Ruffell]

I Installed focal from the daily-pending ISO image, timestamp 2020-02-21 07:52

In the installer I selected LVM + LUKS.

Upon reboot I am shown a text plymouth theme, which is an incorrect screen size and the LUKS password prompt is missing. See attached screenshot.

If you enter your LUKS key into the blank screen and press enter, boot continues but gets stuck at the end. plymouth does not transition to GDM. To get GDM to show, you need to switch to VT3 and back to VT1 with ctrl-alt-f3 and ctrl-alt-f1. GDM will then show and allow the user to log in.

I did some research, and it seems on focal, the default plymouth theme is bgrt, and is a part of the plymouth-theme-spinner package:

$ sudo update-alternatives --config default.plymouth
[sudo] password for ubuntu:
There are 2 choices for the alternative default.plymouth (providing /usr/share/plymouth/themes/default.plymouth).

  Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/share/plymouth/themes/bgrt/bgrt.plymouth 110 auto mode
  1 /usr/share/plymouth/themes/bgrt/bgrt.plymouth 110 manual mode
  2 /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth 100 manual mode
$ sudo apt-file search /usr/share/plymouth/themes/bgrt/bgrt.plymouth
plymouth-theme-spinner: /usr/share/plymouth/themes/bgrt/bgrt.plymouth

plymouth-theme-spinner is not installed on eoan, and ubuntu-logo is the only theme installed on eoan.

I attempted to remove plymouth-theme-spinner and change the plymouth theme to ubuntu-logo, and it sort of works. plymouth can now change to GDM without having to swap VTs, but the screen is totally blank and there is no LUKS password prompt.

All of this is reproducible on a focal installed to KVM.

[Matthew Ruffell (mruffell)]

$ sudo apt-cache policy plymouth
[sudo] password for ubuntu:
plymouth:
  Installed: 0.9.4git20200109-0ubuntu3
  Candidate: 0.9.4git20200109-0ubuntu3
  Version table:
 *** 0.9.4git20200109-0ubuntu3 500
        500 http://nz.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

My desktop PC and KVMs are effected.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you add the journal log from a such boot to the bug?
Also provide plymouth debugging logs as explained on https://wiki.ubuntu.com/Plymouth#Enabling_Debugging

[Matthew Ruffell (mruffell)]

Attached is a standard journalctl with no additional debugging enabled.

[Matthew Ruffell (mruffell)]

Attached is journcalctl with plymouth:debug appended to the kernel command line.

[Matthew Ruffell (mruffell)]

Attached is plymouth debug logs.

[William Grant (wgrant)]

The prompt is visible if you hit Esc, and (at least sometimes?) shows up on the text theme when you hit Esc again. After entering the password, hitting Esc a couple of times gets you into the spinner theme.

[William Grant (wgrant)]

The problem is that the bgrt theme requires resources from /usr/share/plymouth/themes/spinner, but /usr/share/initramfs-tools/hooks/plymouth only copies in the default theme directory (bgrt) plus text as a fallback. Hacking the initramfs-tools hook to always include "spinner" in currthemes avoids the text splash, and gives a very pretty graphical password input instead.

[William Grant (wgrant)]

Which makes this, bug #1856712 and bug #1862485 duplicates, I think.

[Launchpad Janitor (janitor)]

This bug was fixed in the package plymouth - 0.9.4git20200109-0ubuntu3.2

---------------
plymouth (0.9.4git20200109-0ubuntu3.2) focal; urgency=medium

  * debian/patches/git_assert_fix.patch:
    - backport an assert fix from upstream git

 -- Sebastien Bacher <email address hidden> Tue, 03 Mar 2020 18:07:23 +0100