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4. Installing software is a different process
This issue can trip up the new user more than any other. PC users are used to searching for software on the internet, downloading the .exe file, double-clicking it, and waiting for the software installation to complete. So they have to understand that Linux distributions come complete with their own special tool that will do all of that for them.
All they have to do is open the add/remove software tool — such as the Ubuntu Software Centre, PackageKit or Synaptic — search for a piece of software, and install it. New users tend to love the sheer volume of software available. Naturally, some of it is useless, but most of it is good and serves its purpose.
Image credit: Polishlinux.org