I have a non-working Arduino-1.6.5 on my Ubuntu

tl;dr I did alot of weird commands on my ubuntu some tutorial suggested me and now im lost (i just want Arduino to work with custom libraries :( )

First off I am a complete Ubuntu noob but unfortunately there was a OS switch from Windows to Ubuntu on the PC im working on.

After about 8 hours of trying to figure out how to get arduino-1.6.5 on this system I couldnt get it to work (if I run it it seems to crash after loading the configuration).

Now I wonder if some Ubuntu experts can help me out. Is there an easy way to just get rid off all arduino files I have on this pc and just install a fresh one (the correct way)? Or do I have to reinstall my OS

For any info im using Ubuntu 14.04 LTS 32bit if any other information is needed please reply