Question: first things to do after installing kubuntu?
Answer: Configure DNS servers. Use the Google DNS or OpenDNS servers instead of your isp dns servers. ... 
Update and upgrade the system. ... 
Install aptitude and gdebi and synaptic. ... 
Install Yakuake dropdown terminal. ... 
Install Chromium browser. ... 
Install Pidgin. ... 
Install the Roboto fonts. ... 
Fix the Show Desktop widget.