View source for Ubuntu Installation Troubleshooting

== Loss of Network Connectivity ==
Double check your network settings with '''<code>ifconfig</code>''' and '''<code>route -n</code>'''. These should be the settings that you use in the installation. If these are not correct you can change the ip address by issuing the command
 sudo ifconfig eth0 192.168.1.14 netmask 255.255.255.0 up
assuming 192.168.1.14 is your IP address. The route can be changed with
 sudo route add default gw 192.168.1.1
assuming 192.168.1.1 is the address of your router.<br>

This is especially important if you are doing a headless install