failed to start matlabpool using 'local' profile

My desktop runs in Ubuntu 12.04 LTS and the matlab is R2013a. I'm doing local parallel computing(use multicores of my desktop). Before using the following command to start matlabpool, I've already validated the local configuration of parallel computing toolbox. To verify this point, I've attached the figure 1.

                                      figure 1

matlabpool local 4

But it takes like forever to start the matlabpool. After running 10 minutes, the command line is still like:

Starting matlabpool using the 'local' profile ...

So I use ctrl+c to stop it. It always give me:

Operation terminated by user during parallel.internal.pool.InteractiveClient>iGetSingleConnection
(line 737)

Based on the above information, it seems that it get stuck at iGetSingleConnection.

Thanks,