I installed the complete opengeo-suite on Ubuntu Server and it displays that it is working fine here,
opengeo-geoserver:
Installed: 2.5
Candidate: 2.5
Version table:
*** 2.5 0
500 http://apt.opengeo.org/ubuntu/ lucid/main amd64 Packages
100 /var/lib/dpkg/status
But when I try to run the url (http://serverurl/geoserver/web) i am not able to get the admin page.

xdg-open <url>that does it too. – Sam007 May 31 '12 at 21:03