I can run vanilla Mincraft fine and I have had ubuntu 13.04 a mouth or so now. I will try un-installing one.
You can try if you want, but I'm not sure that's what the problem is. Mostly I was checking if, your minecraft broke when you updated to 13.04 (As I am still on 12.10, it was a concern for me
)
The fact that you can run vanilla MC is a good sign, it makes me believe that the error is FTB related, rather than java related.
The crash seems to occur after nei does it's class overwrite. Can you try disabling nei, re-running the launcher and posting any logs?
That's more of what I was getting at. I'm trying to understand more about linux, since right now it's outside of my comfort zone, and I have almost no knowledge about it
It's worth the effort to learn, I've had it installed on all my pc's since 1998, so I'm fairly comfortable with it. I finally went Linux only about 6 months ago when my vista install died, to be honest I haven't missed much. If your interested, pm me and I can send you some information on getting a test environment setup so you can learn more about it.
EDIT:
I just noticed something. It can't find your natives
Code:
2013-05-16 17:37:37 [INFO] [STDERR] Caused by: java.lang.UnsatisfiedLinkError: /home/sean/Desktop/Minecraft/FTB/Direwolf20/minecraft/bin/natives/liblwjgl.so: libjawt.so: cannot open shared object file: No such file or directory
can you go to that directory and tell me what you see there.