How to install .deb package in Debian

1. Using: sudo dpkg -i /path/to/deb/file sudo apt-get install -f
2. Using: sudo apt install ./name.deb Or sudo apt install /path/to/package/name.deb With old apt-get versions you must first move your deb file to /var/cache/apt/archives/ directory. For both, after executing this command, it will automatically download its dependencies.
3. First installing gdebi and then opening your .deb file using it (Right-click -> Open with). It will install your .deb package with all its dependencies.

https://unix.stackexchange.com/questions/159094/how-to-install-a-deb-file-by-dpkg-i-or-by-apt