Forticlient 7.2.2 install on Linux Mint 21.2 Cinnamon [and Ubuntu 20.04+] (Solution provided)

http://docs.fortinet.com/document/forticlient/7.2.2/linux-release-notes/213138/install-forticlient-linux-from-repo-fortinet-com

At this time Fortinet's documentation for Ubuntu 22.04 LTS doesn't work for Linux Mint / Ubuntu straight from the box.

Fortinet's repository doesn't have 'non-free' folder.

To solve it use the following steps, with the necessary changes marked in green:

To install on Ubuntu / Mint 21.2 Cinnamon:

1. Install the gpg key:

   wget -O - https://repo.fortinet.com/repo/forticlient/7.2/ubuntu/DEB-GPG-KEY | gpg --dearmor | sudo tee /usr/share/keyrings/repo.fortinet.com.gpg

2. Create /etc/apt/sources.list.d/repo.fortinet.com.list with the following content:

   deb [arch=amd64 signed-by=/usr/share/keyrings/repo.fortinet.com.gpg] https://repo.fortinet.com/repo/forticlient/7.2/ubuntu/ /stable multiverse

3. Update package lists:

   sudo apt-get update

4. Install FortiClient:

   sudo apt install forticlient

PS: As a matter of fact, these instructions are valid for Ubuntu / Debian, as the repository definition is the same.