unable to use boot menu and ubuntu automatically boots
 

I dual-booted Ubuntu three weeks ago with windows vista. Now I want to get rid of everything windows vista and its partition.

As I restart my computer the esc, f1,f2,f8,del, and f12 keys don't do anything on the screen that says Dell BIOS revision 1.0.3

the next screen is blank. and my monitor, on auto detect(analog input), says cannot display this video mode 1680x1050.

I've tried using the live cd (I just put it in the drive, and don't know what else to do besides that)
I've tried using sudo xrandr --output VGA1 --mode 1024x768 --rate 60 in the terminal but all I get is this -> xrandr: Failed to get size of gamma for output default (I did this because I thought it might be a monitor problem)
I've tried going to disk utility...buts that all mumbo jumbo to me
ex: can anyone explain partitions me? I have: dell utility 49MB FAT,recovery 11 GB NTFS, OS 184 BG NTFS, Extended 56 GB, 53 GB ext4, and finally 2.1 GB Swap 2.1 GB which is the last partition known as sda6. I kinda just wanna delete the first three...

any information on grub and fdisk would be helpful too. Because I don't know where grub is located, on the MasterBootRecorder perhaps?? and I don't know how to use fdisk on the terminal...

If you hold down the "shift" key, then grub2 will display the grub menu.

As to removing windows, you can just delete the partitions using the disk utility.

If you want to use the resulting space, then you should use gparted from a LiveCD to enlarge your existing partitions.

If you need more info about grub2, there is an excellent guide here:

http://ubuntuforums.org/showthread.php?t=1195275

I held down the shift key and grub loading came up, but then Ubuntu still loaded up. Apparently you need to hold down the F12 or at-least I held it down three times before the boot menu worked. Even though I created a gparted live cd, I said to the hell with it, and basically reinstalled Ubuntu all over again. Note: I changed the order to boot a live cd first. Now my whole hard drive is set on the Ubuntu file system. thank god.