dracut: dracut module 'plymouth' will not be installed, because command 'plymouth-set-default-theme' could not be found!

[Julian Andres Klode]

(exploratory dracut analysis)

Installing dracut and using hostonly=yes (https://bugs.launchpad.net/ubuntu/+source/dracut/+bug/2049221) to get a working image, I get a password prompt on the terminal instead of in plymouth, apparently plymouth is not installed into the initrd

[Julian Andres Klode (juliank)]

This is an Ubuntu delta in plymouth, we use alternatives:

    - We use alternatives instead of plymouth-set-default-theme tool:
      + debian/plymouth-themes.{prerm,postinst}: ensure we select one default
        plymouth logo and text themes through alternatives even when we remove
        ubuntu-base ones.
      + debian/rules, debian/plymouth.{install,links), don't ship non
        non alternative-based theme policy files and tools.
      + update plymouth.README.Debian to tell to use update-alternative
        instead of set-default-theme
      + change debian/local/plymouth.hook to use update-alternative to get
        default theme instead of set-default-theme. Also, don't copy
        deleted files to initramfs.

[Julian Andres Klode (juliank)]

Probably we should rebuild plymouth-set-default-theme to use the alternative. This works for read-only use, but setting the alternative could be added too I suppose:

 #!/bin/sh
 readlink -f /usr/share/plymouth/themes/default.plymouth | sed -r 's#.*/themes/([^/]*)/.*#\1#'

[Julian Andres Klode (juliank)]

OK _some_ more work is needed

[Launchpad Janitor (janitor)]

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