[Bug 1867909] Re: plymoth spinner can not show the messages after installation.

[hugh chao]

** Description changed:

  [Summary]
  Before 20.04, when user finished the 1st stage of installation, the message 『please remove the installation medium then reboot』or 『please remove installation medium then press enter』 will be shown on the screen.
  
  But since 20.04, due to the using of plymouth-themes-spinner, the system
  will still waiting for user to press Enter but without any message, so
  the system will be likely hanged there.
  
- 
  [Steps to reproduce]
- 1. Boot the installer with USB sticker 
+ 1. Boot the installer with USB sticker
  2. Finish the installation.
  3. Click the button on the diagram to reboot.
  
  [Expected result]
  System reboot and boot to login page.
  
  [Actual result]
  Black screen and need to press "Enter" to reboot.
  
  [Failure rate]
  100%
  
  [Additional information]
  " lsb_release -rd
  
  Description: Ubuntu Focal Fossa (development branch)
  Release: 20.04
+ 
+ "apt-cache policy plymouth-theme-spinner
+ plymouth-theme-spinner:
+   Installed: 0.9.4git20200109-0ubuntu8
+   Candidate: 0.9.4git20200109-0ubuntu8
+   Version table:
+  *** 0.9.4git20200109-0ubuntu8 100
+         100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/1867909

Title:
  plymoth spinner can not show the messages after installation.

Status in plymouth package in Ubuntu:
  Confirmed

Bug description:
  [Summary]
  Before 20.04, when user finished the 1st stage of installation, the message 『please remove the installation medium then reboot』or 『please remove installation medium then press enter』 will be shown on the screen.

  But since 20.04, due to the using of plymouth-themes-spinner, the
  system will still waiting for user to press Enter but without any
  message, so the system will be likely hanged there.

  [Steps to reproduce]
  1. Boot the installer with USB sticker
  2. Finish the installation.
  3. Click the button on the diagram to reboot.

  [Expected result]
  System reboot and boot to login page.

  [Actual result]
  Black screen and need to press "Enter" to reboot.

  [Failure rate]
  100%

  [Additional information]
  " lsb_release -rd

  Description: Ubuntu Focal Fossa (development branch)
  Release: 20.04

  "apt-cache policy plymouth-theme-spinner
  plymouth-theme-spinner:
    Installed: 0.9.4git20200109-0ubuntu8
    Candidate: 0.9.4git20200109-0ubuntu8
    Version table:
   *** 0.9.4git20200109-0ubuntu8 100
          100 /var/lib/dpkg/status

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