Q:

What should I do at "Installation Type" step in the Ubuntu installation? 

I have put 12.04 onto a USB drive and I am attempting to install Ubuntu this way.  I'm using Windows 8 (I upgraded from Windows 7 myself).  I don't know what to do when I get to "Installation Type" step during the Ubuntu installation. 
I am given a box with 3 things:
dev/sda
dev/sda1  104mb   35mb                        {windows bootloader?} 

dev/sda2  1000000mb unknown                   {this is my hard drive}

Under the box are the following buttons: New Partition Table, Add, Change and Delete. 
And there is another section which says:
Device for bootloader

sda  ATA Seagate    {this is my hard drive}

sda1 Windows 8 bootloader

sda2

I want to dual-boot Windows 8 with Ubuntu without losing any of my Windows partition,
is this possible? 

A:

Realizing this thread is a little dated, I came across it while seeking info on installing Ubuntu onto OS X and just wanted to close it up for the next person who might stumble across it. 
To answer the question, know that when you get to the point in the process where you have to choose between overwriting your existing install (Windows or OS X), or "something else", choose "install over existing".  The installer will advance to the next step and allow you to chose which partition or drive you wish to install Ubuntu onto. 
I just went through this with my MacBook and was stumped for a moment, but then I realized that no installer is just going to wipe you're drive without asking at least twice to confirm it's something you really want to do. 
Maybe in future installers they might include a small note "You will be able to select where you want to install Ubuntu on the next screen." 
Hope this helps. 

A:

Your sda1 partition is an EFI partition.  Don't erase it or you won't be able to boot Windows any more. 
To install Ubuntu:

boot into Windows.  Via the Windows partitioning tools, reduce your Windows partition until it becomes, let's say 80GB for example. 
Run the Ubuntu installer.  It should now propose the "Install alongside" option.  If it doesn't, choose the Something else option, and create 2 partitions (root and swap) in the free space, see this page for more info.