Ok, well I just did a fresh install of ubuntu 12.04. On this machine it has 6 core amd, 8gb memory, running latest JDK6 and 7. Same thing occurs, click play, loads, launcher momentarily disappears and pops back to launcher screen. Only happens on attack of b-team mod. Looked at logs and I see this error
[b#431] 2014/03/25 16:26:56 [iNFO] 2014-03-25 16:26:56 [sEVERE] [ForgeModLoader] An error occurred trying to configure the minecraft home at /home/(PCNAME)/.technic/modpacks/attack-of-the-bteam for Forge Mod Loader.
So is it some kind of rights issue? The location is correct, just can't do what it needs to.
Any suggestions? Again, new machine, different hardware, same issue. just not sure what to do about it.