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Ubuntu is not a certified distro for 11gr2 - http://docs.oracle.com/cd/E11882_01/install.112/e24321/pre_install.htm#CHDFFBIF
You can certainly attempt an installation, but you will be on your own to troubleshoot any issues during the install or after.
If you can live with an older version of Ubuntu 11.04 perhaps the following is helpful:
Install Oracle 11gR2 on Ubuntu Linux 11.04 (64-bit) Howto
Otherwise, install VirtualBox and run Oracle Linux as a virtual machine.