I've been trying hard to disable Dell R710 RAID mechanism to install Ubuntu Server 12.04 LTS on the server but I couldn't so far.
Based on this question's answers, I should boot using a live cd (done using ubuntu desktop 11), but the mentioned commands shows unexpected responses.
sudo os-prober, returns nothing
sudo dmraid -rE, returns
no block devices found !
Previously I deleted the 3 virtual disks and their controller, should I try to reconfigure them again ?!