Public bug reported:

Running 18.04 off a boot usb stick works flawlessly, however after a
clean install the login screen is very laggy and once I enter my
password the screen resolution is all messed up and unreadable.

If I reboot and hold down shift to get the Grub menu and choose Advanced
then recovery mode and then without altering anything I choose resume
from the recovery menu and the login screen works perfectly.

All system updates are done.

System Specs
Processor               : Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
Memory                  : 131656MB (2342MB used)
Machine Type            : Supermicro
Operating System        : Ubuntu 18.04.1 LTS
Date/Time               : Sun 13 Jan 2019 01:28:23 PM AST
-Display-
Resolution              : 1024x768 pixels
OpenGL Renderer         : llvmpipe (LLVM 6.0, 256 bits)
X11 Vendor              : The X.Org Foundation

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

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https://bugs.launchpad.net/bugs/1811595

Title:
  18.04 laggy login but works fine  off of boot usb

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