Linux
Flatpak
The recommended way to install Commet on Linux is using the Flatpak build, as it has the best compatibility with most distros.
To install, download the flatpak and then install it from the terminal:
flatpak install /path/to/download/chat.commet.commetapp.flatpak
Other Methods
There is also a .deb build available for Debian based distros, which you can find on the GitHub Releases