Debian users must create file /etc/apt/sources.list.d/indexdata.list and use Debians own package management tools, apt-get or apt. Replace xxxxx with bullseye, buster, stretch, etc. As of September 2021, Debian buster (10) is old stable. Debian bullseye (11) is current stable. # For Debian 11 (bullseye) or later proceed as follows: /etc/apt/sources.lists.d/indexdata.list should have the following content: deb [signed-by=/usr/share/keyrings/indexdata.gpg] https://ftp.indexdata.com/debian xxxx main deb-src [signed-by=/usr/share/keyrings/indexdata.gpg] https://ftp.indexdata.com/debian xxxx main Get indexdata.gpg key: sudo wget -O /usr/share/keyrings/indexdata.gpg \ https://ftp.indexdata.com/debian/indexdata.gpg # For older Debian releases: /etc/apt/sources.lists.d/indexdata.list should have the following content: deb https://ftp.indexdata.com/debian xxxxx main deb-src https://ftp.indexdata.com/debian xxxxx main These packages are signed with a key you can install as follows: wget https://ftp.indexdata.com/debian/indexdata.asc sudo apt-key add indexdata.asc