To check the version of Ubuntu just use the lsb_release command as shown below and you will be able to see the exact Ubuntu version you have installed.
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
At first it was configured as a RAID 0, then I deleted the Virtual Disk Group.
I thought both drives would be shown and detected in Linux as sda and sdb but it actually shows nothing.
To make them work you have to hit Ctrl+R before the system boots (when prompted) and create a Virtual Disk Group. In my case I created each one as RAID 0 (with a single drive only) as I just wanted JBOD but there is no such option or default in these Dell Pe........