I tried to install 13.04 daily(April 2nd) but there was no possibility to create a EFI Partition in "Something else". I was afraid to use "Erase everything and install", because I don't know if it would've worked... If i do not create a new partition table, I could edit the existing EFI Partition(Ubuntu 12.10 is installed) and use it as "Reserved BIOS Space", is this the same? If so, why can't I select it with a new Partition table?
I'm using a Ideapad U410.