This resolved the issue for me:

"If you wish to do it permanently, edit

/etc/gdm3/custom.conf and uncomment the line

#WaylandEnable=false by removing the # in front.

Save the file and then on reboot you will never see the cog asking for
which session to use."

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  [artful] Mouse broken after upgrade from 17.04 to 17.10

Status in gnome-shell package in Ubuntu:

Bug description:
  After upgrading from 17.04 to 17.10, I encounter strange mouse issues,
  namely :

  - The mouse cursor moves allright

  - But mouse clicks are completely ignored both in Gnome's gdm and once
  logged in to the desktop, they are also ignored in all the Gnome panel
  and lef side dock.

  However, once started using keyboard, mouse DOES work INSIDE applications 
allright (all the times), and SOME windows can be moved by dragging their title 
bar when focus is given to them (i.e. I currently have a gedit window that I 
can move around with the mouse, while I cannot move a gnome-terminal or the 
firefox in which I type this text).
  Also, a directory/file selection dialog for the "save" action in gedit works 
perfectly well with the mouse.

  This is definitely not a hardware mouse issue.

  But I cannot change focus with the mouse, I have to [Alt]-[Tab] to
  change window.

  Also if I shift focus to the desktop, I can interact with icons on the
  desktop and the right-click on the background *may* work.

  I've purged all the .something config dirs in my homedir to no avail
  (and I don't believe it relates to it because gdm shows this behaviour
  even before I actually login).

  I've seen the exact same problem (after upgrade from 17.04 to 17.10)
  being reported on miscellaneous forums by at least 3 other people. So
  I'm not alone, but I have no clue.

  Trying to investigate this I checked a big part of my system's
  configuration and fell upon im-config.

  I have noticed that, when completely uninstalled (all the files that
  it refers to being removed), then reinstalled, this package actually
  FAILS installing any of its configuration files (but without any error
  message), resulting in the following situation :

  root@totor:~# dpkg -r --force depends im-config
  dpkg: im-config : problème de dépendance, mais suppression comme demandé :
   language-selector-gnome dépend de im-config (>= 0.29-1ubuntu10~).

  (Lecture de la base de données... 387605 fichiers et répertoires déjà 
  Suppression de im-config (0.32-1ubuntu3) ...
  Traitement des actions différées (« triggers ») pour man-db ( ...
  Traitement des actions différées (« triggers ») pour desktop-file-utils 
(0.23-1ubuntu3) ...
  Traitement des actions différées (« triggers ») pour gnome-menus 
(3.13.3-6ubuntu5) ...
  Traitement des actions différées (« triggers ») pour mime-support 
(3.60ubuntu1) ...

  root@totor:~# apt-get install im-config
  Lecture des listes de paquets... Fait
  Construction de l'arbre des dépendances       
  Lecture des informations d'état... Fait
  Les NOUVEAUX paquets suivants seront installés :
  0 mis à jour, 1 nouvellement installés, 0 à enlever et 0 non mis à jour.
  Il est nécessaire de prendre 0 o/24,5 ko dans les archives.
  Après cette opération, 365 ko d'espace disque supplémentaires seront utilisés.
  Sélection du paquet im-config précédemment désélectionné.
  (Lecture de la base de données... 387551 fichiers et répertoires déjà 
  Préparation du dépaquetage de .../im-config_0.32-1ubuntu3_all.deb ...
  Dépaquetage de im-config (0.32-1ubuntu3) ...
  Paramétrage de im-config (0.32-1ubuntu3) ...
  Traitement des actions différées (« triggers ») pour mime-support 
(3.60ubuntu1) ...
  Traitement des actions différées (« triggers ») pour desktop-file-utils 
(0.23-1ubuntu3) ...
  Traitement des actions différées (« triggers ») pour man-db ( ...
  Traitement des actions différées (« triggers ») pour gnome-menus 
(3.13.3-6ubuntu5) ...

  root@totor:~# dpkg -V im-config
  ??5?????? c /etc/X11/Xsession.d/70im-config_launch
  ??5?????? c /etc/X11/xinit/xinputrc
  ??5?????? c /etc/default/im-config
  ??5?????? c /etc/profile.d/

  Any help greatly appreciated, my desktop being currently quite unusable.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: im-config 0.32-1ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Nov  5 09:42:24 2017
  EcryptfsInUse: Yes
   Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] 
failed with exit code 1: Hint: You are currently not seeing messages from other 
users and the system.
         Users in the 'systemd-journal' group can see all messages. Pass -q to
         turn off this notice.
   No journal files were opened due to insufficient permissions.
  PackageArchitecture: all
  SourcePackage: im-config
  UpgradeStatus: Upgraded to artful on 2017-10-21 (14 days ago)
  modified.conffile..etc.X11.Xsession.d.70im-config_launch: [deleted]
  modified.conffile..etc.X11.xinit.xinputrc: [deleted] [deleted] [deleted]

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