This affects me too:
## System
* **Ubuntu:** 26.04 (upgraded from 24.04)
* **Display manager:** GDM 50.0
* **Desktop:** GNOME Flashback (Metacity)
* **Session launcher:** `/usr/libexec/gdm-x-session`
* **X server:** `/usr/lib/xorg/Xorg`
## Symptom
Electron/Chromium applications incorrectly try to use Wayland and fail.
Example with Mullvad 2026.3:
Failed to connect to Wayland display
Failed to initialize Wayland platform
The platform failed to initialize.
Segmentation fault
## Evidence that the session is actually X11
echo $DISPLAY
:0
echo $WAYLAND_DISPLAY
# empty
Process tree:
gdm-session-worker
└── gdm-x-session
└── Xorg
This is an X11 session.
## Incorrect session metadata
However:
echo $XDG_SESSION_TYPE
wayland
`loginctl` reports:
Type=wayland
even though the session is running through `gdm-x-session` and `Xorg`.
Also:
systemctl --user show-environment | grep XDG_SESSION_TYPE
returns
XDG_SESSION_TYPE=wayland
So the incorrect value has been imported into the user systemd environment.
## Additional oddity
`XDG_SESSION_ID` is empty:
although `loginctl` shows an active session (635).
## Confirmed workaround
Running:
XDG_SESSION_TYPE=x11 /opt/Mullvad\ VPN/mullvad-vpn
starts Mullvad correctly.
This strongly indicates Electron is choosing the backend solely from
`XDG_SESSION_TYPE`.
putting "export XDG_SESSION_TYPE=x11" in ~/.xessionrc seems to work
around the problem
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https://bugs.launchpad.net/bugs/2150576
Title:
[ubuntu-mate] XDG_SESSION_TYPE set wrong after upgrade to 26.04
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