[Bug 1578006] Re: Xenial minimal install: "W: plymouth: The plugin label.so is missing, the selected theme might not work as expected."

[Daniel Richard G.]

On a minimal install:

# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.4.0-22-generic
W: plymouth: The plugin label.so is missing, the selected theme might not work as expected.
W: plymouth: You might want to install the plymouth-themes and plymouth-label package to fix this.

# apt-get install plymouth
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  plymouth-theme-ubuntu-text
Suggested packages:
  desktop-base plymouth-themes
The following packages will be upgraded:
  plymouth plymouth-theme-ubuntu-text
2 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
Need to get 116 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://apt.example.com:3142/ubuntu xenial-proposed/main amd64 plymouth amd64 0.9.2-3ubuntu13.1 [107 kB]
Get:2 http://apt.example.com:3142/ubuntu xenial-proposed/main amd64 plymouth-theme-ubuntu-text amd64 0.9.2-3ubuntu13.1 [9,078 B]
Fetched 116 kB in 2s (39.0 kB/s)                 
(Reading database ... 82205 files and directories currently installed.)
Preparing to unpack .../plymouth_0.9.2-3ubuntu13.1_amd64.deb ...
Unpacking plymouth (0.9.2-3ubuntu13.1) over (0.9.2-3ubuntu13) ...
Preparing to unpack .../plymouth-theme-ubuntu-text_0.9.2-3ubuntu13.1_amd64.deb ...
Unpacking plymouth-theme-ubuntu-text (0.9.2-3ubuntu13.1) over (0.9.2-3ubuntu13) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (229-4ubuntu4) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up plymouth (0.9.2-3ubuntu13.1) ...
update-initramfs: deferring update (trigger activated)
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Setting up plymouth-theme-ubuntu-text (0.9.2-3ubuntu13.1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.122ubuntu8) ...
update-initramfs: Generating /boot/initrd.img-4.4.0-22-generic

# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.4.0-22-generic


Fix is verified.

(Did notice this unrelated issue, however:
https://bugs.launchpad.net/bugs/1580445 )

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https://bugs.launchpad.net/bugs/1578006

Title:
  Xenial minimal install: "W: plymouth: The plugin label.so is missing,
  the selected theme might not work as expected."

Status in plymouth package in Ubuntu:
  Fix Released
Status in plymouth source package in Xenial:
  Fix Committed

Bug description:
  [SRU Justification]
  All users of ubuntu-text-based plymouth themes get a spurious warning when generating initramfs.  This warning is trivially fixable.

  [Regression potential]
  Only the regression potential of a new binary build.  The only change to the code is to bypass this warning message for the 'ubuntu-text' plugin.

  [Test case]
  1. Install the plymouth-theme-ubuntu-text package.
  2. Uninstall/deconfigure all graphical themes (e.g.: apt remove plymouth-theme-ubuntu)
  3. Run update-initramfs -u
  4. Confirm that a warning message is shown about label.so being missing.
  5. Install plymouth from -proposed.
  6. Run update-initramfs -u
  7. Confirm that no warning message is shown.
  8. Boot and confirm that the text theme is shown correctly.

  
  I installed a minimal Xenial system. Whenever the initramfs is regenerated, I see

      W: plymouth: The plugin label.so is missing, the selected theme might not work as expected.
      W: plymouth: You might want to install the plymouth-themes and plymouth-label package to fix this.

  The following plymouth packages are installed:

      # dpkg -l | grep plymouth
      ii  libplymouth4:amd64                 0.9.2-3ubuntu13                 amd64        graphical boot animation and logger - shared libraries
      ii  plymouth                           0.9.2-3ubuntu13                 amd64        boot animation, logger and I/O multiplexer
      ii  plymouth-theme-ubuntu-text         0.9.2-3ubuntu13                 amd64        boot animation, logger and I/O multiplexer - ubuntu text theme

  A minimal install of Ubuntu should pull in the appropriate packages so
  that Plymouth doesn't complain. (As it is, I don't see much of a
  splash screen on startup.)

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