Linux client hangs at checking firewall after September 4th update

[Norseman]

After receiving the September 4th update and clicking "enter game world" and verifying my client hangs at the checking firewall window, which remains gray until I kill the process. No error message is given. I then restored a previously functioning backup which gave me the same result after receiving the update. I am yet to reinstall anew. I am running Ubuntu 8.04 and have included a screenshot of the above.