[Bug 2004092] [NEW] Live ISO login is utterly broken, package causing problem is currently unknown

[Launchpad Bug Tracker]

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Normally, when one first boots a live ISO, a desktop automatically
appears, asking users if they want to try or install Ubuntu (or, in the
case of Lubuntu, they are simply dropped into a working desktop with an
installation desktop icon available). As of the Lubuntu ISO on January
27, 2023, this has stopped occuring. Plymouth shows the initial boot
animation, but the user is then dropped to a solid black screen. No user
input is accepted. Attempting to switch to a TTY and sign in fails with
the default "lubuntu" username and a blank password (the error "Login
incorrect" is displayed).

On Ubuntu Desktop, the behavior is even stranger. Rather than being
shown a "Try or Install Ubuntu" screen, an initial system setup wizard
appears that takes the user through the process of creating a user
account. On a live ISO. Only after this wizard is finished does the "Try
or Install Ubuntu" screen appear. Attempting to log into a TTY using the
default "ubuntu" username and a blank password fails the same way as
Lubuntu does, if done before the wizard is finished. However, one can
log into a TTY if they finish the wizard and then attempt to log into
the TTY using the credentials provided during user account setup.

This issue affects at least the Lubuntu ISOs as of January 27, 2023, and
the Ubuntu Desktop ISO at least as of January 28, 2023 (it is assumed
that the 27th ISO for Ubuntu Desktop is also broken). The ISO from the
26th is most likely unaffected as there is successful testing
information for Lubuntu on the 26th, so something likely happened
between the 26th and the 27th to cause this breakage.

Steps to reproduce:

1. Download the latest Lunar daily ISO of Ubuntu Desktop or Lubuntu.
2. Boot the ISO (hardware is irrelevant - this appears to occur on both physical and virtual hardware).

For Lubuntu:

3. Wait until you are dropped to a black, blank screen.
4. Wait a while, then attempt to switch to a TTY and attempt to log in using "lubuntu" as the username and a blank password. The login attempt will be denied.

For Ubuntu Desktop:

3. Wait until you are provided with an initial system setup wizard.
4. Switch to a TTY and attempt to log in using "ubuntu" as the username and a blank password. The login attempt will be denied.
5. Switch back to the system setup wizard, and complete it.
6. After completing the wizard, switch to a TTY again and attempt to log in using the credentials provided to the wizard. The login attempt will be successful.

Notes:

Casper cannot be what changed to cause this, as Casper was changed in
early December.

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Live ISO login is utterly broken, package causing problem is currently unknown
https://bugs.launchpad.net/bugs/2004092
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