Apt-usage

Install package 
 apt-get install <packagename> 
 search package 
 apt-cache search <packagename> or <packagedescription> 
 remove package 
 apt-get remove <packagename> to remove but letting configfiles untouched 
 apt-get purge <packagename> to remove with configfiles and without checking dependencies 
 apt-get autoremove remove unneccesary Packages 
 Update Package-Cache 
 apt-get update 
 Upgrade Packages 
 and (without installing additional) dependencies 
 àpt-get upgrade 
 can lead to breaking. To install needed dependencies do: 
 apt-get install -f 
 Upgrade whole OS 
 apt-get dist-upgrade