How to install Kvantum

I'm running Kubuntu 17.04 and want to install Kvantum, but apparently there is no package. How do I do that? Maybe a PPA, maybe download a .deb file?

When I installed the Adapta-KDE theme, Kvantum manager installed automatically:

sudo add-apt-repository ppa:papirus/papirus
sudo apt-get update
sudo apt-get install --install-recommends adapta-kde

Hope that it helps! :-)

For Debian / Ubuntu / Linux Mint, there are deb binaries available to download but for a quite old version (Kvantum 0.10.5, released back in October, 2017).

To install the latest Kvantum in Debian, Ubuntu or Linux Mint, you can compile it from source. To do this, follow the steps below.

Install the build dependencies

sudo apt install g++ cmake libx11-dev libxext-dev qtbase5-dev libqt5svg5-dev libqt5x11extras5-dev libqt4-dev qttools5-dev-tools libkf5windowsystem-dev git

Download the latest source

mkdir -p ~/repos/tsujan && cd ~/repos/tsujan
git clone https://github.com/tsujan/Kvantum.git && cd Kvantum
git checkout master

Compile kvantum

cd Kvantum
mkdir build && cd build
cmake ..
make

Install kvantum

sudo make install

Get Qt applications to use kvantum

echo "export QT_STYLE_OVERRIDE=kvantum" >> ~/.profile

After this, logout and log back in. To apply Kvantum system-wide, and not just for your user, you could add export QT_STYLE_OVERRIDE=kvantum in /etc/environment instead of ~/.profile.

To completely uninstall

If you want to uninstall Kvantum installed from source, start by opening a terminal, navigating to the folder where you've extracted (in the build folder from the Kvantum/Kvantum directory if you've followed our instructions) and built the source - e.g. cd ~/repos/tsujan/Kvantum/Kvantum/build, and running this command:

sudo make uninstall

You'll also need to remove the export QT_STYLE_OVERRIDE=kvantum line from your ~/.profile file. To do this, open ~/.profile with a text editor, e.g. kate:

kate ~/.profile

And remove the QT_STYLE_OVERRIDE=kvantum line from this file, then save it, logout and log back in.

Source: https://www.linuxuprising.com/2018/05/use-custom-themes-for-qt-applications.html with some adaptations of my own.

sudo add-apt-repository ppa:papirus/papirus
sudo apt update
sudo apt install qt5-style-kvantum qt5-style-kvantum-themes