Oracle Database Discussions

i have a question. is it possible to install on Ubuntu 8.04 amd64 server any oracle server?
my purpose is to make a database with oracle on any other computer that runs on my ubuntu server.
i followed few tutorials and everytime i got this error:

Hit http://oss.oracle.com unstable Release
W: Failed to fetch http://oss.oracle.com/debian/dists/unstable/Release Unable to find expected entry main/binary-amd64/Packages in Meta-index file (malformed Release file?)
E: Some index files failed to download, they have been ignored, or old ones used instead.



sources.list is ok i think:
deb http://oss.oracle.com/debian unstable main non-free