Problem:

Ubuntu Rackspace cloud server can’t access internet via firefox or ping. This occurs after install ubuntu desktop on a rackspace cloud server.

Solution:

Temporary fix: modify resolve.cnf

`sudo vi /etc/resolve.cnf` 

`   nameserver 173.203.4.8
    nameserver 173.203.4.9
`

Permanent fix: disable network-manager or configure it to default set needed name servers.Main entry continued