Public bug reported:

My system has worked fine for many moons.

Last night, it stopped being able to launch some apps from the launcher.

I figured it might need a restart, since I had updated software.

Now it will not boot.

When I go to grub, I can select the normal kernel or older kernel. It will not 

Ubuntu splash screen, the 5 dots turn red, then it freezes, then it goes
to black screen and says:

[     0.000000] ACPI BIOS Error (bug): Failure looking up 
[/_SB.PCIO.XHC.RHUB.HS11], AE_NOT_FOUND (20180105/dswload-211)
[     0.000000] ACPI Error: AE_NOT_FOUND, During name lookup/catalog 
[     0.000000] ACPI ERROR: AE_NOT_FOUND, (SSDT:xh_rvp11) while loading table 
[     0.000000] ACPI Error: 1 table load failures,  12 successful 
[     1.536258] nouveau 0000:01:00.0: DRM: Pointer to THDS table invalid
/dev/nvme0n1p5 clean, 412566/5767168 files, 21898623/23040283 blocks
/dev/nvme0n1p5 clean, 412566/5767168 files, 21898623/23040283 blocks

And it will be stopped for a while, then the _ cursor will blink as if
active/alive, then it will freeze again. I can't do anything from this

Though the errors claim to be hardware, my suspicion is software,
possibly graphics drivers, because the problem is at the point where you
have to turn on the login screen, classic moment where Ubuntu+ graphics
drivers fail. Maybe it's gdm, maybe it's the weird Wayland that has to
happen at the login screen, I  don't know. I'm on the same machine in
Windows, experiencing normal behavior, so I believe it's something
Ubuntu introduced in the past 24 hours or so that wrecked itself.

** Affects: gnome-sushi (Ubuntu)
     Importance: Undecided
         Status: New

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  Ubuntu 18.04 fails to get to login screen

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