One of the major difference that Windows users find while switching to Ubuntu will be the overheating issue. The CPU and Graphic card temperature will almost reach 60 degree celsius even when the laptop is idle. And some users will also find reduced Battery Backup in Ubuntu.
KRename App Renames Multiple Files in Ubuntu Linux
Dropbox Folder Not Found Error in Ubuntu 14.04 after Installation
Display CPU and Graphics Temperature in Ubuntu 14.04
Ubuntu 14.04 is the latest version of Ubuntu Operating System, its faster and smoother than older version with minor changes in design like sidebar. By now Ubuntu has many of softwares available at Ubuntu Software Center like Office Applications, Media Players, Encryption Tools and even alternative for ccleaner.