I wanted to upgrade from Ubuntu 14.04 LTS to the new Ubuntu 15.04 on my Dell XPS 14 2015 Developer Edition, because most issues seemed to be fixed in the live version.
Therefore I wiped the hole disk (without doing it easier) and now the XPS isn't able to find any bootable media. Then I tried to install it with the help of this guide which gave me the hint to create a new partition table.
The installation worked fine and I saw in the live version of Ubuntu that the system and my account under
/home was installed.
But the notebook still can't find any bootable media. Are there any other aspects that I didn't consider?
The problem could be solved by enabling UEFI booting in the BIOS (press F12 during the boot) and by disabling 'Legacy option ROMS'. Take a look at this DELL blog post. Follow the instructions and reinstall your system.