Trouble installing Ubuntu 12.04 LTS 64-bit on Del R320

Hello.

I'm trying to install Ubuntu 12.04 LTS 64-bit on a Dell R320 server, which is setup with a RAID 1 (H310) for 2 SATA HDDs (for the OS and applications) and RAID 10 (H710) for 4 SAS HDDs (for data). 
I have setup the machine to boot with UEFI.

I burnt the ISO image of Ubuntu onto a CD and proceeded with the installation, choosing a guided installation with encrypted LVM.

After taking care of several options and seeing lots files getting copied, the system rebooted.

Once the initial boot information was displayed on screen, I got the following error: "efidisk read error". I thought the server had frozen there, but then Ubuntu was loaded normally (or so it seems).

Furthermore, running sudo parted /dev/sda print all gives me the following:

Model: DELL PERC H310 (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt


Number Start End Size File system Name Flags
1 17.4kB 200MB 200MB fat32 boot
2 200MB 456MB 256MB ext2
3 456MB 250GB 249GB lvm


Error: /dev/sdb: unrecognised disk label

Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/cryptswap1: 17.1GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 17.1GB 17.1GB linux-swap(v1)


Error: /dev/mapper/te--server-swap_1: unrecognised disk label

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/te--server-root: 232GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 232GB 232GB ext4

The RAID 10 volume is nowhere to be found.

Any suggestions?

Thank you in advance!