It appears the wayland session does not start on my XPS 13 on Ubuntu 17.10 and 18.04 if I use bash as my default shell. It only works if I switch my default shell to fish.
How I discovered the issue:
I've used fish for a few years now. Recently I realized that snap apps don't show up in Gnome shell dash. Turns out `/var/lib/snapd/desktop/` was not part of `$XDG_DATA_DIRS`. Turns out it is set by one of the scripts in `/etc/profile.d/` and since I've set fish as my default shell, this never runs. I solved this by adding this manually in my fish configuration. That solved the issue.
However, I was worried that /etc/profile.d might contain more important scripts and new apps might add more scrpts there that I don't want to miss out on, so I switched back to bash to try it out. To my surprise the wayland session stopped working. GDM logged me in to a black screen with white cursor in the center. The cursor does not move and nothing happens.
I thought this might be because one of the scripts in /etc/profile.d/ so I removed them all. Also removed /etc/bash.bashrc. However this did not fix the issue at all. I removed the bashrc related files in my home directory as well.
So for me, wayland session does not start when bash is my default shell. Only works with fish.
It might be related to this: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1739019
However, I cannot prove that X11 fails because of the same reason because it never runs irrespective of whether I use bash or fish as my default shell.
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ApportVersion: 2.20.8-0ubuntu5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2017-11-19 (30 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
Package: gnome-shell 3.26.2-0ubuntu2
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Tags: third-party-packages wayland-session bionic
Uname: Linux 4.13.0-17-generic x86_64
UpgradeStatus: Upgraded to bionic on 2017-12-01 (18 days ago)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
_MarkForUpload: True
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