oracle@ubuntuserver:~$ sudo cobbler check
[sudo] password for oracle:
The following are potential configuration items that you may want to fix:

1 : One or more repos need to be processed by cobbler reposync for the first time before kickstarting against them: natty-x86_64-security, precise-i386, precise-x86_64-security, lucid-x86_64, precise-i386-security, hardy-x86_64, oneiric-x86_64-security, lucid-i386, oneiric-i386, natty-x86_64, lucid-x86_64-security, natty-i386, hardy-i386, oneiric-i386-security, hardy-i386-security, precise-x86_64, maverick-x86_64-security, lucid-i386-security, maverick-i386-security, maverick-x86_64, maverick-i386, natty-i386-security, hardy-x86_64-security, oneiric-x86_64

Restart cobblerd and then run 'cobbler sync' to apply changes.