Question: important things to do after installing ubuntu?
Answer: Download and Install Latest Updates. Well this is the first thing I always do whenever I install new operating system on any device. ... 
Additional Repositories. ... 
Install Missing Drivers. ... 
Install GNOME Tweak Tool. ... 
Enable Firewall. ... 
Install Your Favorite Web Browser. ... 
Install Synaptic Package Manager. ... 
Remove Apport.