boot - How do I downgrade Plymouth without breaking lightdm? - Ask Ubuntu

after many weeks of searching, i've found new solution boot-up plymouth earth-sunrise start earlier , last longer. read how in (plymouth not work properly) write-up on gentoo site.

i've read highly voted q&a (how downgrade package via apt-get?) doesn't address peculiarities of plymouth , it's relationship lightdm.

below plymouth versions want (0.8.8) , installed 1 (0.9.2):

─────────────────────────────────────────────────────────────────────────────── rick@dell:/var/log$ apt-cache showpkg plymouth | grep 0.8.8   lightdm,plymouth 0.8.8-0ubuntu18   lightdm,plymouth 0.8.8-0ubuntu18 ─────────────────────────────────────────────────────────────────────────────── rick@dell:/var/log$ apt show plymouth package: plymouth version: 0.9.2-3ubuntu13.1 priority: standard section: x11 origin: ubuntu maintainer: ubuntu developers <ubuntu-devel-discuss@lists.ubuntu.com> original-maintainer: laurent bigonville <bigon@debian.org> bugs: https://bugs.launchpad.net/ubuntu/+filebug installed-size: 452 kb depends: libc6 (>= 2.14), libdrm2 (>= 2.4.25), libplymouth4 (>= 0.9.2), initramfs-tools | dracut, init-system-helpers (>= 1.18) recommends: plymouth-theme-ubuntu-text | plymouth-theme suggests: desktop-base, plymouth-themes conflicts: console-common, plymouth-theme-lubuntu-text (<< 0.57~) breaks: plymouth-drm (<< 0.9.0-6~), plymouth-theme-edubuntu (<< 15.12.1~), plymouth-theme-kubuntu-logo (<< 1:16.04ubuntu1~), plymouth-theme-kubuntu-text (<< 1:16.04ubuntu1~), plymouth-theme-lubuntu-logo (<< 0.57~), plymouth-theme-sability (<< 1.3~), plymouth-theme-sabily-text (<< 1.3~), plymouth-theme-ubuntu-gnome-logo (<< 16.04.1~), plymouth-theme-ubuntu-gnome-text (<< 16.04.1~), plymouth-theme-ubuntu-logo (<< 0.9.2-3ubuntu1~), plymouth-theme-ubuntu-mate-logo (<< 15.12.1~), plymouth-theme-ubuntu-mate-text (<< 15.12.1~), plymouth-theme-ubuntu-text (<< 0.9.2-3ubuntu1~), plymouth-theme-ubuntustudio (<< 0.50~), plymouth-theme-xubuntu-logo (<< 15.12.1~), plymouth-theme-xubuntu-text (<< 15.12.1~), plymouth-themes (<< 0.9.0-8~) replaces: libplymouth2 (<< 0.9.2-3ubuntu1~), plymouth-drm (<< 0.9.0-6~), plymouth-themes (<< 0.9.0-8~) homepage: http://www.freedesktop.org/wiki/software/plymouth task: standard, ubuntu-touch-core, ubuntu-touch, ubuntu-touch, ubuntu-sdk supported: 5y download-size: 107 kb apt-manual-installed: yes apt-sources: http://ca.archive.ubuntu.com/ubuntu xenial-updates/main amd64 packages description: boot animation, logger , i/o multiplexer  plymouth provides boot-time i/o multiplexing framework - obvious  use provide attractive graphical animation in place of  text messages shown during boot. (the messages  instead redirected logfile later viewing.) however, in event-driven  boot systems plymouth can usefully handle user interaction such  password prompts encrypted file systems.  .  package provides basic framework, enabling text-mode animation.  n: there 1 additional record. please use '-a' switch see ─────────────────────────────────────────────────────────────────────────────── rick@dell:/var/log$ 

my problem package want downgrade called lightdm,plymouth 0.8.8-0ubuntu18 , installed package called plymouth 0.9.2-3ubuntu13.1. i'm not sure how square circle.

another concern have messing lightdm cause kinds of headaches.

using highly voted q&a above type:

sudo apt-get install "lightdm,plymouth"=0.8.8-0ubuntu18 apt-mark hold "lightdm,plymouth" 

or correct format:

sudo apt-get install plymouth=0.8.8-0ubuntu18 apt-mark hold plymouth 

or totally different???

thanks in advance.

• "lightdm,plymouth"=0.8.8-0ubuntu18 has wrong syntax, plymouth=0.8.8-0ubuntu18 correct one. man apt-get

  install pkg [{=pkg_version_number | /target_release}]... 

  so these forms correct (space separator):

  install plymouth install plymouth=0.8.8-0ubuntu18 install plymouth/trusty  install lightdm plymouth=0.8.8-0ubuntu18 install lightdm=1.18.1-0ubuntu1 plymouth=0.8.8-0ubuntu18 

• however version 0.8.8-0ubuntu18 not available in repository. put there skip older versions, last 1 0.8.8-0ubuntu17.1.

  to complete, may want verify yourself:

  http://archive.ubuntu.com/ubuntu/pool/main/p/plymouth/
  http://old-releases.ubuntu.com/ubuntu/pool/main/p/plymouth/