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By default Ubuntu does not support to open files ending in rar from rarlab (winrar), then from it to open winrar files will require manual installation to open the zip file.

A simple way to install winrar in ubuntu is to download an additional application with the command apt-get of ubuntu, the way is as follows:

1. open a console terminal on your Ubuntu after previous login into the ubuntu OS.
2. then type or paste the following command: sudo apt-get update && sudo apt-get install rar unrar
3. once finished type or paste the following command: sudo apt-get clean
4. upgrade your OS with the command: sudo apt-get upgrade

congratulations, now winrar files can be open on your Ubuntu operating system.