I just discovered that if you install Ubuntu Maverick 10.10 as described here...
http://elinux.org/BeagleBoardUbuntu
The 'Web Browser' doesn't start: one gets a dialogue box stating 'input/output' error.
I don't think the binary 'WebBrowser' exists when I test for 'which WebBrowser'.
Now installing Firefox, maybe that will work.
Bob