Oracle on Debian AMD-64

I see following error during pkg update:

shell>apt-get update
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?)
Reading package lists... Done
W: Couldn't stat source package list Free and Open Source Software from Oracle unstable/main Packages (/var/lib/apt/lists/oss.oracle.com_debian_dists_unstable_main_binary-amd64_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list Free and Open Source Software from Oracle unstable/non-free Packages (/var/lib/apt/lists/oss.oracle.com_debian_dists_unstable_non-free_binary-amd64_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.

shell>cat /etc/apt/sources.list | grep orac
deb Index of /debian unstable main non-free
deb-src Index of /debian unstable main

Is there is any way to install Oracle on amd64?