[ubuntu] Help to Install Ubuntu

UEFI or BIOS boot?
Either way I now suggest gpt over the 35 year old MBR partitioning.

GPT Advantages (older but still valid) see post#2 by srs5694:
http://ubuntuforums.org/showthread.php?t=1457901
https://wiki.archlinux.org/index.php...antages_of_GPT
http://en.wikipedia.org/wiki/Unified...ware_Interface
http://askubuntu.com/questions/62947...br-why-not-mbr
UEFI Advantages
http://askubuntu.com/questions/64730.../647604#647604
http://askubuntu.com/questions/44696...y-vs-uefi-help

But with with UEFI install is a bit more tricky as you have to partition in advance and include an ESP - efi system partition. But grub will only install to ESP on sda, so you have to copy files to sdb's ESP.
If BIOS and gpt partitioning, you must have a 1 or 2MB bios_grub partition.
I normally make all gpt drives with both the ESP & bios_grub, so in future I can install Ubuntu even if currently plaed only as data drive and in either boot mode.

For the Total space you want for Ubuntu:
Ubuntu's standard install is just / (root) & swap, but it is better to add another partition for /home if allocating over 30GB.:
Only if gpt - all partitions in gpt are primary (no logicals):
gpt: 300 MB efi FAT32 w/boot flag (for UEFI boot or future use for UEFI, you only can have one per drive, so if already existing do not attempt another)
gpt: 1 or 2 MB No Format w/bios_grub flag (for BIOS boot not required for UEFI)
for gpt(GUID) or MBR(msdos) partitioning
Ubuntu partitions - smaller root only where hard drive space is limited.
If total space less than about 30GB just use / not separate /home or standard install.

1. 20-25 GB Mountpoint / primary or logical begiing ext4
2. all but 2 GB Mountpoint /home logical begiing ext4
3. 2 GB Mountpoint swap logical

Depending on how much memory you have you may not absolutely need swap but having some is still recommended. I do not hibeate (boots fast enough for me) but if hibeating then you need swap equal to RAM in GiB not GB. And if dual booting with windows a shared NTFS partition is also recommended. But you usually caot create that as part of the install, just leave some space. Or partition in advance (recommended).
One advantage of partitioning in advance is that the installer will use the swap space to speed up the install. Thanks Herman for the tip.
https://help.ubuntu.com/community/DiskSpace
suggested partitions for just Ubuntu on 3TB drive.
http://askubuntu.com/questions/33643...rtition-scheme
Another advanced suggestion from TheFu with Multiple / (root) - Post #5 similar to what I actually do
http://ubuntuforums.org/showthread.php?t=2170308
http://ubuntuforums.org/showthread.php?t=2021534
UEFI/gpt partitioning in Advance:
http://askubuntu.com/questions/74309...-pc-for-ubuntu
http://askubuntu.com/questions/33643...rtition-scheme