Public bug reported:

When I ran "sudo update-grub" after changing the line in grub.conf to be
"GRUB_CMDLINE_LINUX="nomodeset", the screen turned to black and the
windows would not appear. I was forced to open a tty session and reboot.

Expected Results:
The command runs but the screen does not turn black until I initiate a 
shutdown/reboot

Actual Results:
The screen turns black and the startup tasks and status appear over a black 
background, as it would when I push the up key when ubuntu starts up.

This issue occurred at around 3:47 PM, EDT, on November 29, 2019.

Description:    Ubuntu 18.04.3 LTS
Release:        18.04

mutter:
  Installed: 3.28.4-0ubuntu18.04.2
  Candidate: 3.28.4-0ubuntu18.04.2
  Version table:
 *** 3.28.4-0ubuntu18.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     3.28.1-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

xorg:
  Installed: 1:7.7+19ubuntu7.1
  Candidate: 1:7.7+19ubuntu7.1
  Version table:
 *** 1:7.7+19ubuntu7.1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     1:7.7+19ubuntu7 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mutter 3.28.4-0ubuntu18.04.2
ProcVersionSignature: Ubuntu 4.15.0-70.79-generic 4.15.18
Uname: Linux 4.15.0-70-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 29 15:45:03 2019
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1854536

Title:
  When I ran "update-grub" after editing the grub.conf file to have
  GRUB_CMDLINE_LINUX="nomodeset" written in it, the screen turned to
  black and displayed the running taks with the green "OK" letters next
  to them

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