Plymouth BGRT theme does not work due to missing files in initramfs

[Shinjo Park]

The package 'plymouth-theme-spinner' provides a BGRT theme, which shows the UEFI vendor logo in the Plymouth boot splash. Because the theme file /usr/share/plymouth/themes/bgrt/bgrt.plymouth contains "ImageDir=/usr/share/plymouth/themes/spinner", it expects the animation image files from the same path. However, the initramfs hook for Plymouth at /usr/share/initramfs-tools/hooks/plymouth is not aware of this, and does not copy the said directory to the initramfs. As a result, it will fall back to the text based Plymouth theme.

Current workaround is modifying the /usr/share/initramfs-tools/hooks/plymouth so the images from the spinner theme is included:
$ diff -urN plymouth.orig plymouth.new
--- plymouth.orig 2020-02-09 00:41:21.122823787 +0100
+++ plymouth.new 2020-02-09 00:41:12.510535377 +0100
@@ -54,7 +54,7 @@
 fi

 # copy base themes content
-currthemes="${THEME_NAME} ${TEXTTHEME_NAME}"
+currthemes="${THEME_NAME} ${TEXTTHEME_NAME} spinner"
 for currtheme in $currthemes
 do
        case "${currtheme}" in

System information:
$ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10
$ apt-cache policy plymouth
plymouth:
  설치: 0.9.4git20190712-0ubuntu4.1
  후보: 0.9.4git20190712-0ubuntu4.1
  버전 테이블:
 *** 0.9.4git20190712-0ubuntu4.1 500
        500 http://de.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.9.4git20190712-0ubuntu4 500
        500 http://de.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
$ apt-cache policy plymouth-theme-spinner
plymouth-theme-spinner:
  설치: 0.9.4git20190712-0ubuntu4.1
  후보: 0.9.4git20190712-0ubuntu4.1
  버전 테이블:
 *** 0.9.4git20190712-0ubuntu4.1 500
        500 http://de.archive.ubuntu.com/ubuntu eoan-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     0.9.4git20190712-0ubuntu4 500
        500 http://de.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages

[Launchpad Janitor (janitor)]

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

[Cruz Fernandez (cruz-fernandez)]

I didn't need to patch the file /usr/share/initramfs-tools/hooks/plymouth adding "spinner" there. I've noted though that adding more themes I see the related file `/usr/share/plymouth/themes/spinner/spinner.plymouth` on the script

    sudo update-alternatives --config default.plymouth

[Cruz Fernandez (cruz-fernandez)]

On latest 0.9.4git20200323-0ubuntu6 is not being reproduced this problem.

[Cruz Fernandez (cruz-fernandez)]

Also, I think this bug is not duplicate of #1864586