Error: Could not start listener: Permission denied

[soc22 at drexel.edu (Steve Coward)]

Hi,

Up to this point I've had no problems in using/updating Metasploit. 
However, I downloaded both the current snapshot and the 2.6 version, 
extracted, and attempted to use several of the modules, and when I use 
it to exploit, it returns this error:

"Error: Could not start listener: Permission denied"

My system is:
Ubuntu 6.06 LTS Dapper (x86)

I thought that I had all of the folder/binary permissions correct (at 
least so it seems), but maybe not? Has anyone else encountered this 
issue as well? If someone could help me out with what I might need to do 
in order to correct this problem, that would be great! Thanks so much..

Steve