UBUNTU. Check version of package

In order to check the version of a package (either installed or in repository):

apt-get install apt-show-versions


apt-show-versions -a <package>

Ubuntu Linux: Uninstall / Remove Any Installed Software

Uninstall / Delete / Remove Package

Just use the following syntax:

 sudo apt-get remove {package-name}

 For example remove package called mplayer, enter:
 $ sudo apt-get remove mplayer

Remove package called lighttpd along with all configuration files, enter:
 $ sudo apt-get --purge remove lighttpd


To list all installed package, enter:
dpkg --list
dpkg --list | less
dpkg --list | grep -i 'http'