1. Add the BitDefender repository key to the list of apt trusted keys:
wget http://download.bitdefender.com/repos/deb/bd.key.asc sudo apt-key add bd.key.asc
2. Add the following line to the /etc/apt/sources.list file:
deb http://download.bitdefender.com/repos/deb/ bitdefender non-free
3. Refresh your apt cache by running:
apt-get update
4. Install the desired BitDefender packages using your prefered apt front-en For example:
apt-get install bitdefender-mail
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