How to install .deb package file in Ubuntu

FREQUENTLY ASKED QUESTIONS (Ubuntu)
Q: How to install .deb package in Ubuntu linux?

.Deb is the extension of packages used in debian distributions like Ubuntu, etc.
The following command will install the .deb package in ubuntu linux

command: sudo dpkg <package.deb>

Eg:
user@ubuntu:~$ sudo dpkg /tmp/xxxxxx.deb
Selecting previously deselected package xxxxxx.
(Reading database ... 114174 files and directories currently installed.)
Unpacking xxxxxx (from /tmp/xxxxxx.deb) ...
Setting up xxxxxx (6.8.90) ...
user@ubuntu:~$

LABELS: Debian, extra-tips, FAQ, How-To, linux, Ubuntu