Public bug reported:
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.
** Affects: plymouth (Ubuntu)
Importance: Critical
Status: New
** Tags: champagne focal
** Attachment added: "Screenshot of bgrt theme waiting on password prompt which
doesnt exist"
https://bugs.launchpad.net/bugs/1864586/+attachment/5330762/+files/Screenshot%20from%202020-02-25%2015-02-51.png
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https://bugs.launchpad.net/bugs/1864586
Title:
plymouth does not ask for LUKS password and does not change tty
properly
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