Partitioning

Create two primary partitions: create a 1.1 GB swap partition, and use the rest as Ext4 partition with mount point "/". Set the second one to "bootable".

Network setup

Modify /etc/network/interfaces. You should have two network interfaces (eth0 and eth1 where one is the NAT interface and the other one the vboxnet0 interface), but only one has been configured by the Ubuntu installer. Assuming eth1 is the vboxnet0 interface, the file should contain these contents:

    
     ...
    auto eth0
    auto eth1
    iface eth0 inet dhcp
    iface eth1 inet static
    address 192.168.56.101
    netmask 255.255.255.0
   

Replace 192.168.56.101 with your desired (static) IP address. After the modification, run "ifup eth1" to get the interface working.

Adding a repository for Sun Java:

Add the following line to /etc/apt/sources.list:

    deb http://archive.canonical.com/ubuntu lucid partner

After this run apt-get update.