VirtualBox 7.2

[siamhie]

I thougt maybe it was a configuration problem ...

Yep. The VB 7.2 .deb package is Qt6 and MX comes with QT PLATFORMTHEME settings set to gtk2. I fixed that. Don't know if it will break something else.

I don't know if you might have the qt6gtk2 package installed.

Package: qt6gtk2
Version: 0.4-1~mx23
State: installed
Automatically installed: yes
Multi-Arch: same
Priority: optional
Section: x11
Maintainer: Steven Pusser <stevep@mxlinux.org>

To enable it for all Qt applications, export QT_QPA_PLATFORMTHEME=qt6gtk2 or 'gtk2', 'qt5gtk2' also work for compatibility reasons.
To avoid visual bugs, ensure that the environment variable QT_STYLE_OVERRIDE is not set before usage.

[DeepDayze]

I thougt maybe it was a configuration problem ...

Yep. The VB 7.2 .deb package is Qt6 and MX comes with QT PLATFORMTHEME settings set to gtk2. I fixed that. Don't know if it will break something else.

Seems newer Qt6 apps now don't seem to run if you are using any gtk2 based theme. As an aside I had this sort of issue on MX-23.6 as the latest Brave and Vivaldi browsers also fail to run if you have a gtk2 theme, so this may mean you'd have to change themes. I installed Fluxbox and those browsers open on there and not in Plasma 5, so this may confirm your issue with the new VB.

[BV206]

qt6gtk2 is already installed. Here are the packages that MX 23.6 Xfce ISO has that begin with qt:

Code: Select all

ii  qt-heif-image-plugin                  0.3.3-1~mx23                           amd64        Qt 5 Plugin for HEIF Images
ii  qt5-gtk-platformtheme:amd64           5.15.8+dfsg-11+deb12u2                 amd64        Qt 5 GTK+ 3 platform theme
ii  qt5-gtk2-platformtheme:amd64          5.0.0+git23.g335dbec-4+b7              amd64        Qt 5 extra widget styles - GTK+ 2 Platform theme
ii  qt5-image-formats-plugins:amd64       5.15.8-2                               amd64        Qt 5 Image Formats module
ii  qt5-style-plugin-cleanlooks:amd64     5.0.0+git23.g335dbec-4+b7              amd64        Qt 5 extra widget styles - Cleanlooks
ii  qt5-style-plugin-motif:amd64          5.0.0+git23.g335dbec-4+b7              amd64        Qt 5 extra widget styles - Motif
ii  qt5-style-plugin-plastique:amd64      5.0.0+git23.g335dbec-4+b7              amd64        Qt 5 extra widget styles - Plastique
ii  qt5-style-plugins:amd64               5.0.0+git23.g335dbec-4+b7              amd64        Qt 5 extra widget styles
ii  qt6-gtk-platformtheme:amd64           6.4.2+dfsg-10                          amd64        Qt 6 GTK+ 3 platform theme
ii  qt6-translations-l10n                 6.4.2-1                                all          translations for Qt 6
ii  qt6gtk2:amd64                         0.3-0.1~mx23+1                         amd64        GTK 2 integration plugins for Qt6

Since I don't know crap, I thought maybe MX needed qt6ct or qt5ct so VB could recognize the font or some other setting they changed. It seems like I had problems with qt apps several years ago and went back to Linux Mint and everything worked.

I searched for PLATFORMTHEME in the config files in /etc and found
/etc/X11/Xsession.d/56xfce4-qtconfig
It has comments:
#set qt environment variables to follow user chosen platform
#default plugin is gtk2
#$HOME/.config/MX-Linux/qt_plugin.conf can hold a user settable value

I created a ~/.config/MX-Linux/qt_plugin.conf that only contains
qt6ct
Then I installed qt6ct, rebooted, ran qt6ct to select the fonts and icon theme and then VB worked.

Then I remembered that in the past some programs needed a ~/.gtkrc-2.0 file for gtk2 settings. I don't know if that is still true. MX 23 doesn't ship with it.

[BV206]

I created a ~/.config/MX-Linux/qt_plugin.conf that only contains
qt6ct

I changed it from qt6ct to qt6gtk2, uninstalled qt6ct ,rebooted and that also works.

[siamhie]

I created a ~/.config/MX-Linux/qt_plugin.conf that only contains
qt6ct

I changed it from qt6ct to qt6gtk2, uninstalled qt6ct ,rebooted and that also works.

I recall having to do that for a program awhile back in fluxbox. (can't remember the name)

My startup file went from

Code: Select all

# export Qt variables
export QT_QPA_PLATFORMTHEME=gtk2
export QT_PLATFORMTHEME=gtk2
export QT_PLATFORM_PLUGIN=gtk2

to

Code: Select all

# export Qt variables
export QT_QPA_PLATFORMTHEME=qt6gtk2
export QT_PLATFORMTHEME=qt6gtk2
export QT_PLATFORM_PLUGIN=qt6gtk2

I do remember it messing with some of the other gtk2 themed programs.

That's "Life in a Window Manager". (Hey, that could be my new signature )