[Bug 1864586] Re: plymouth does not ask for LUKS password and does not change tty properly

[Steve Langasek]

** Tags removed: champagne

** Changed in: plymouth (Ubuntu Focal)
     Assignee: (unassigned) => Steve Langasek (vorlon)

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

Status in plymouth package in Ubuntu:
  Confirmed
Status in plymouth source package in Focal:
  Confirmed

Bug description:
  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.

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