You need to open some rar file.
You want to open .rar files in Ubuntu.
If you want to use .rar files unter Ubuntu you have to install an additional packet.
First open system > system management > software repositories and activate the "multiverse" and "universe" repositories. Second open the console and type "sudo apt-get install rar" to install the rar-packet.
Afterwards its possible to open and extract .rar files with your filemanager (e.g. Nautilus).
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.