[Bug 1761644] Re: Delete the password for the live session on all flavors

[Rik Mills]

This change results in not being able to log in to the live session
again with sddm, should you log out or restart X.

sddm does not support passwordless login it seems:

https://github.com/sddm/sddm/issues/751

** Bug watch added: github.com/sddm/sddm/issues #751
   https://github.com/sddm/sddm/issues/751

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https://bugs.launchpad.net/bugs/1761644

Title:
  Delete the password for the live session on all flavors

Status in casper package in Ubuntu:
  Fix Released

Bug description:
  
  A historical Ubuntu GNOME bug fix deleted the password for the live user. To get around auto-login bugs in gdm. These later carried over to Ubuntu when they switched back to GNOME.

  Now seems like the other flavors want this behavior also. It avoids
  the password prompts when logging into a TTY for example.

  My previous hack from a few years ago of injecting a systemd unit is
  no longer required, lets just delete the "blank" password when we add
  the live session user in casper.

  [Test Case]
  1. Login to a tty should not require you to press "enter" at the password: prompt (for blank password)
  2. Under gnome-shell you should not be able to lock the screen with <super+L> or through the user menu

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