From here:
I use Ubuntu 12.04 Unity 64bit :>/
THe Files you requested: http://pastebin.com/uYTcQCfM
I think... and this answer isn't as clear... but it seems like you've symlinked in the 64bit version of libgsm?
libgsm.so.1: wrong ELF class: ELFCLASS64
[MissingLibGsm]
"Level"="Suggest"
"Title"="Missing 32bit libgsm.so.1 library"
"Description"="Lets Windows applications use the GSM codec for audio compression and decompression."
That could be preventing the game from starting... nope, that's on my system too.
The other logs look fine as well. We've tried on a 64bit Ubuntu 12.04 system with an Nvidia 460 GTX and the game works.
- my system is AMD but I have access to a few Nvidia systems and was hoping there was a subtle problem there, not so
So, let's backup.
Did all of the components successfully install for you?
If yes, can you gather a log file of launching Cube World, no flags?
Note that it takes a long time for Cube World to start on my end. Also note, this line:
fixme:exec:SHELL_execute flags ignored: 0x00000100
Is a red herring. I get it too. I need to see what happens after that that could be preventing the game from starting.