Many people report that Ubuntu Server suddenly reverts its static IP address to dynamic (via DHCP). Here are some discussions: static ip reverts back to DHCP (ubuntuforums.org). Static IP reverting to DHCP on Ubuntu Server 8.04 (www.howtogeek.com). This happened to me today with Ubuntu Server 9.04. Rebooting the server after installation have solved this problem.
You need to change addresses into following files: /etc/network/interfaces /etc/resolv.conf The following article from www.howtogeek.com prefers vi editor, but I use nano editor. sudo nano /etc/network/interfaces change to something like this iface eth0 inet static address 192.168.1.5 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 and DNS settings sudo nano /etc/resolv.conf and then restart sudo […]