Hello guys,
I want to install VirtualBox on Clear Linux Desktop edition. I don’t find any documentation, so i make tutorial 
Before doing this, please check you have already enable virtualization in BIOS, it’s very important. This installation support languages and theme, but they need to be setup before the installation.
I make silent video for example and demonstration : Install Virtualization (Virtualbox, VMware) on Clear Linux 2020 - YouTube
Commands :
sudo swupd check-update (for update the system)
sudo swupd bundle-add kernel-native-dkms (bundle for virtualization)
sudo swupd bundle-add wget (optionnal but recommanded)
mkdir build && cd build && wget https://download.virtualbox.org/virtualbox/6.1.10/VirtualBox-6.1.10-138449-Linux_amd64.run
chmod +x VirtualBox*.run && ./VirtualBox*.run (make executable and install package)
sudo /sbin/vboxconfig (add virtualization modules to the kernel by compiling)
sudo reboot (for reboot the system)
If you need help, respond to this topic and i try to help about this.