Xfce Forum

marmar

Member

Registered: 2025-11-24

Posts: 3

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: 12,421

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: 849

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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Siduction
Debian Sid
Xfce 4.20 with Wayland/Labwc

marmar

Member

Registered: 2025-11-24

Posts: 3

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: 849

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
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ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,421

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: 849

Re: Appimage (Nextcloud) ignores dark mode

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

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Siduction
Debian Sid
Xfce 4.20 with Wayland/Labwc

marmar

Member

Registered: 2025-11-24

Posts: 3

Re: Appimage (Nextcloud) ignores dark mode

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

eriefisher, I installed the "AppImage Manager", changed its visual theme to dark and also changed the undocumented setting "mode" to dark
However it does not affect the  visual theme of Nextcloud.

ToZ and eriefisher, after reading https://appimage.org/ and https://github.com/linuxdeploy/linuxdep … issues/155 I guess Appimages lack the ability to detect theme and mode of the host, let alone setting theme and mode of the app inside the Appimage.

Added later 17 min 41 s:
I just read that an Appimages can update automatically https://github.com/AppImage/AppImageSpe … nformation

It is a real pain that Nextcloud does not update automatically.
In comparison, the visual theme is a very minor issue.