Xfce Forum

marmar

Member

Registered: 2025-11-24

Posts: 2

Appimage (Nextcloud) ignores dark mode

I start the Nextcloud client from the official Appimage  (Nextcloud-4.0.1-x86_64.Appimage) on Debian 12 Xfce

A minor inconvenience is that the client appears in light mode while my system is in dark mode

Starting it with

GTK_THEME=Adwaita:dark Nextcloud-4.0.1-x86_64.Appimage

has no effect

I opened an issue at Nextcloud https://github.com/nextcloud/desktop/issues/9126
The first reaction claims that "this is a xfce issue".

All my applications are in dark mode, except Nextcloud.
For Krusader, I had to install and configure "Qt5 settings".

Nextcloud is the only Appimage I use.
What is the story with Appimages and dark mode?

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,354

Re: Appimage (Nextcloud) ignores dark mode

Isn't Nextcloud built on QT6? Meaning you need to look at GTK/QT6 integration solutions.

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eriefisher

Wanderer

From: ON, Canada

Registered: 2008-10-25

Posts: 807

Re: Appimage (Nextcloud) ignores dark mode

For qt6
https://software.opensuse.org//download … ge=qt6gtk2

for qt5
qt5-gtk-platformtheme

Also, but unfamiliar with the package.
qt6-gtk-platformtheme

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Xfce 4.20 with Wayland/Labwc

marmar

Member

Registered: 2025-11-24

Posts: 2

Re: Appimage (Nextcloud) ignores dark mode

Thank you both.

qt5-gtk-platformtheme was already installed and I installed qt6-gtk-platformtheme, but without effect.

Krusader is a KDE (Qt) application, I understand I have to make an effort when I use it in a GTK Desktop.
I thought an Appimage supports both KDE (Qt)  and GTK desktops.
Or only KDE and Gnome?

eriefisher

Wanderer

From: ON, Canada

Registered: 2008-10-25

Posts: 807

Re: Appimage (Nextcloud) ignores dark mode

Appimage doesn't care, the problem comes with theming, look and feel.

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I AM CANADIAN!
Siduction
Debian Sid
Xfce 4.20 with Wayland/Labwc

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,354

Re: Appimage (Nextcloud) ignores dark mode

FWIW, on Arch, I installed qt6ct and configured it to run a dark theme. I then installed kate (a QT6 app) and the nextcloud appimage.

Running them like this:

QT_QPA_PLATFORMTHEME=qt6ct kate

...resulted in a dark themed kate.

Running with the NextCloud appimage:

QT_QPA_PLATFORMTHEME=qt6ct ./NextCloud....

...did not work.

Grabbing the kate appimage also didn't work.

I think the issue might be with appimages. It would be interesting to see if this works in other GTK environments like Mate or Cinnamon.

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eriefisher

Wanderer

From: ON, Canada

Registered: 2008-10-25

Posts: 807

Re: Appimage (Nextcloud) ignores dark mode

Maybe this will help?
https://github.com/tunjayoff/appimagema … theming.md

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I AM CANADIAN!
Siduction
Debian Sid
Xfce 4.20 with Wayland/Labwc