QGIS Desktop doesn't start | no DISPLAY environment variable set

Ask Fedora
1

Hi,
I installed QGIS Desktop from Fedora repo. It launched ok initially but since some time it doesn’t start when launched from the application menu. What can i do ?

2

Launch it from command line and see the error message that it’s throwing.

1 Like
3

It says : QGIS starting in non-interactive mode not supported. You are seeing this message most likely because you have no DISPLAY environment variable set.

4

When asking for help with an issue, you should provide enough detail to allow others to reproduce the problem. In particular, which versions of Fedora and QGIS are you using?

5

Fedora 41 KDE Plasma, QGIS is repo version.

6

QGIS has had updates. Here it does launch the same as with other apps.

Compare (in a terminal) what you have with:

$ type qgis
qgis is /usr/bin/qgis
$ qgis --version
QGIS 3.40.5-Bratislava 'Bratislava' (exported)
$ env | grep DISPLAY
DISPLAY=:0
GNOME_SETUP_DISPLAY=:1
WAYLAND_DISPLAY=wayland-0
$ qgis
Warning: QSocketNotifier: Can only be used with threads started with QThread

(qgis:187790): Gtk-WARNING **: 16:00:33.671: Theme parsing error: <data>:1:0: Expected a valid selector
True

Many large applications generate warnings but still function properly for most needs.

You may find error messages by running (in a terminal) journalctl --no-hostname -g qgis.

7 
[alexandre@Host-004 ~]$ type qgis
qgis est /usr/bin/qgis
[alexandre@Host-004 ~]$ qgis --version
QGIS 3.40.5-Bratislava 'Bratislava' (exported)
[alexandre@Host-004 ~]$ env | grep DISPLAY
WAYLAND_DISPLAY=wayland-0
[alexandre@Host-004 ~]$ qgis
QGIS starting in non-interactive mode not supported.
You are seeing this message most likely because you have no DISPLAY environment variable set.
8

I have QGIS on multiple systems and there are some differences in the message when I run qgis in terminal, but QGIS does start.

Do you have libSM (the X.Org X11 SM (Session Management) runtime library)?

QGIS has many “add-ons”. What do you get for qgis --no-plugins in a terminal?

Try creating a new user login and see if QGIS works for that user. If so, look at your ~/.config/QGIS/qgis.conf file.