I am unable to launch GUI using gtk-3 from service which i had created.
As per the log Error i can see is below:
–> ser[32211]: Locale not supported by C library.#012#011Using the fallback ‘C’ locale.
–> 32211]: Unable to init server: Could not connect: Connection refused
–> 2211]: cannot open display:
I have already added below in stage-packages for this GUI:
stage-packages:
libgtk-3-dev
libgtk-3-0
Just a note - GUI is an error dialog.
My actual SNAP name is “lenovo-wwan-dpr”
Any information to debug this issue will be very much helpful.
Thank you
It looks like you aren’t using one of the desktop extensions, which not only give you the libgtk but also connects to the interfaces necessary to open dialogs. See https://snapcraft.io/docs/gnome-3-38-extension
I have already tried using extension and x11 but still getting same issue without “devmode”.
I have created test app to explain my issue below:
Below is the observation:
Command -> snap install --dangerous --devmode test-gui_1.0.0-test_amd64.snap
and then snap run test-gui
Result is OK (able to see window )
command -> snap install --dangerous test-gui_1.0.0-test_amd64.snap
result - Fail result
Issue is below:
Warning: Schema “org.gnome.system.locale” has path “/system/locale/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy” has path “/system/proxy/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.http” has path “/system/proxy/http/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.https” has path “/system/proxy/https/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.ftp” has path “/system/proxy/ftp/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.socks” has path “/system/proxy/socks/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
/snap/test-gui/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0: /snap/test-gui/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libffi.so.7: no version information available (required by /snap/test-gui/x1/usr/lib/x86_64-linux-gnu/libwayland-client.so.0)
/snap/test-gui/x1/bin/test_gui: /snap/test-gui/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libffi.so.7: no version information available (required by /snap/test-gui/x1/usr/lib/x86_64-linux-gnu/libwayland-client.so.0)
No protocol specified
Unable to init server: Could not connect: Connection refused
(test_gui:26227): Gtk-WARNING **: 11:24:36.836: cannot open display:
service which i had created has “daemon: oneshot” . It gives same error as above 2)
Any information regarding this will be helpful.
Thank you !!
well, are you starting your app from within a graphical terminal on a desktop or are you trying to launch it from a tty without any graphical environment … the test app above, laubnched manually from a graphical terminal definitely goes beyond the “cannot open display:” error (which translates to “i can not connect to a running graphical session”) if i build and run it here
Thank you for your reply.
yes , i am running in graphical terminal. If i install using “–devmode” then i can see pop-up window after performing “snap run gtk-gui” . but , it goes “can not open display error” when i install without “–devmode”
just adding the slot to the app is enough to allow it to talk to the session bus (if you’d upload this to the store the upload would go into manual review, but it has not effects when using the snap locally)
either way, this was just solving the issue i had here with your test app … it is still not clear why you get the “cannot open display” error when doing the same …
Ok … I can see same result using command “snap connections test-gui|grep dbus” .
So , in my environment installing snap with “–devmode” , its working but not without it.
Again getting "cannot open display” when i install without devmode.
Not sure why its happening .
