Login to ubuntu from your usual administrative account which has sudo access
Make sure you have enough ram, swap space and disk space as per oracle requirements.
Install the required packages (first make sure ‘universe’ is enabled in your sources.list):

sudo apt-get install build-essential libaio rpm lesstif2-dev alien

Create the users and groups oracle needs:

sudo groupadd oinstall
sudo groupadd dba
sudo [...]

System Config: Compaq Presario v3033au, AMD Turion X2 TL-50, 2GB RAM, 100GB SATA HDD

PC came with WXPH pre-installed, used PartitionMagic to create a 100mb and a 12GB partition for the /boot and / partitions.
Downloaded and burned the Alternate (amd64) CD from one of the ubuntu mirrors.
Booted from the CD, choose ‘OEM Install’, figured it would [...]

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Connect the O2 to your pc via any usb port and turn on the modem on the phone.

Type: cat /proc/bus/usb/devices

Look out for “Windows USB Modem”

Check the values of vendor and productid for that listing, in my case, they are 0408 [...]