To install a downloaded Debian (Ubuntu) package (.deb) :-
# sudo dpkg -i packagename.deb # sudo dpkg -i /home/jay/Downloads/net-tools_1.60+git20181103.0eebece-1ubuntu5_amd64.deb Selecting previously unselected package net-tools. (Reading database ... 197399 files and directories currently installed.) Preparing to unpack .../net-tools_1.60+git20181103.0eebece-1ubuntu5_amd64.deb ... Unpacking net-tools (1.60+git20181103.0eebece-1ubuntu5) ... Setting up net-tools (1.60+git20181103.0eebece-1ubuntu5) ... Processing triggers for man-db (2.10.2-1) ... #
To remove a Debian (Ubuntu) package (.deb): # sudo dpkg -r packagename
To Reconfigure/Repair an installed Debian (Ubuntu) package (.deb):
# sudo dpkg-reconfigure packagename