uninstall Arduino 2%3a1.0.5+dfsg2-4_a to install Arduino 1.5.8

On the PC : UBUNTU 14.10
installed Arduino
Downloaded Arduino 1.5.8 32 bit
Start of mess.
Only Arduino 2%3a1.0.5+dfsg2 appears.
No trace of Yun
( I have seen on Windows instructions list uniinstall previopus versions is required.

How can I get read of ald Arduino traces in UBUNTU 14.10 and goto YUN?

Thank you in advance.

Please as well let me know which ports I should check opened for Yun, in case, and how to open them.

Sorry to be a nuisance.