Public bug reported:

I just updated bionic and suddenly:
  * No 'Ubuntu on Wayland' login option.
  * The 'Ubuntu' login option is very slow -- glxinfo reports LLVMpipe 
(software rendering)

WORKAROUND: sudo apt remove libegl1

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.26.2-0ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Sat Feb 24 13:59:46 2018
DisplayManager: gdm3
InstallationDate: Installed on 2017-12-12 (73 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libglvnd (Ubuntu)
     Importance: Critical
         Status: New

** Affects: mesa-demos (Ubuntu)
     Importance: Critical
         Status: New

** Tags: amd64 apport-bug bionic regression-update

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  [regression] Missing Wayland login option and missing GL acceleration,
  after installing mesa-utils-extra 8.4.0

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