Is there a way to apply GNOME GTK theme (I use GNOME 40.5 and Ubuntu 21.10) to Dolphin File manager? As Dolphin is QT, I guess I cannot apply the same exact theme used by GNOME on that, but if there is a way to apply themes on Dolphin maybe I can at least find an adequate theme and use that beside my GNOME theme.

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You cannot apply directly GTK theme to QT app, but you can apply QT styles that recreates GTK look and feel. These styles are available after installing the packages:

sudo apt install qt5-style-kvantum qt5-style-kvantum-themes

Then, you need to tell to your system to use kvantum style for QT5 apps. This is performed by setting the QT_STYLE_OVERRIDE variable in your .profile file.

You have two alternative ways.

Alternative 1

• run echo "export QT_STYLE_OVERRIDE=kvantum" >> $HOME/.profile

Alternative 2:

• open the file with gedit $HOME/.profile
• add the line (if not present) export QT_STYLE_OVERRIDE=kvantum
• save the file.

After changing the .profile file, you have to logout from your account and login, then it will be sourced once automatically.

Now, open the Kvantum Manager app from the app-grid menu:

• Click on the submenu "Change/Delete Theme"
• Select "KvYaru" from "Select Menu".
• Click "Use this theme" button.

This is the way to activate a style that resembles the default Ubuntu theme, called Yaru. By default, a lots of themes are installed, so you can choose what you prefer.

The Kvantum project is available at this GitHub page.

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