it's better to enable -proposed and install libgl1-mesa-glx after apt
update (and not do full dist-upgrade to avoid unrelated updates)... not
sure if just that is enough, might need some other packages too

the packages should migrate "soon", now that all the blockers have been
sorted out

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  [regression] Missing Wayland login option and missing GL acceleration,
  after installing libegl1

Status in libglvnd package in Ubuntu:
Status in mesa-demos package in Ubuntu:
Status in mir package in Ubuntu:
Status in mutter package in Ubuntu:

Bug description:
  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)

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