Public bug reported:

Unable to log into 18.04. Worked for about a month, then suddenly
stopped. Boot appeared normal until login screen. Login screen appeared
to be "greyed out", mouse and keyboard did not work. System clock
appeared ok.

CTL-ALT-F2 did not open new terminal. CTL-ALT-F7 did not reset login
screen or desktop.

Changed boot process to verbose. No errors observed on startup.

I've recovered a lot of Ubuntu machines, this problem is new to me.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul  8 13:02:50 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed 
boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic ubiquity-18.04.14 ubuntu

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https://bugs.launchpad.net/bugs/1780672

Title:
  login screen "greyed out", no mouse or keyboard inputs

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