The main challenge for each user of Ubuntu Linux and other distributions are the basic commands for the console. Sometimes simply that command line is the only way for example the configuration of drivers.

These are the basic commands for the package manager - APT which I prepared for the beginners:

Installing packages

sudo aptitude install

eg: sudo aptitude install firefox

Removing packages

sudo aptitude remove

eg: sudo aptitude remove firefox
or: sudo apt-get purge firefox

Search packages

sudo aptitude search

eg: sudo aptitude search firefox

Updating packages

sudo aptitude upgrade

eg: sudo aptitude upgrade firefox

In fact, using Linux commands is very quick and simple even for the beginners.