You want to fill in PDF forms on Ubuntu : here is a solution.
You want to share contacts and calendar between an Android phone and the emails reader Thunderbird (on a computer), here is a solution !
You want to modify PDF on Ubuntu : here is a solution.
You want to know the differences between similar files : here are some solutions !
You want to use subtitles with SUP format: here's how to do it !
You've forgotten the keyboard shortcut for Ubuntu 12.04 with Unity ?
Two lists that might be helpfull !
You want to burn mixed CD (aka Extra CD), i.e. with Audio tracks (so you can use them on HiFi equipments) and data tracks on Ubuntu or Lubuntu : here's your answer !
With Ubuntu, there are many ways to connect to a remote computer.
You want to use VCards in Ubuntu ... here is all there's to know !