grub 2.0 has /boot/grub/grub.cfg (which is created/modified by "sudo update-grub") (the old grub had /boot/grub/menu.lst )
HOLD THE SHIFT KEY DOWN DURING BOOT TO ENSURE YOU SEE THE GRUB MENU
Configuration should occur with: /etc/default/grub and /etc/grub.d/ (remember after modifying above to run sudo grub-update )
this file has a few more grub settings, most importantly, the timeout
GRUB_CMDLINE_LINUX_DEFAULT="quiet" (delete the quiet to see full boot messages)
OR, if you want to hide everything uncomment the 2 HIDDEN LINES and set the TIMEOUTS to 0
afterwards, run update-grub
grub-install --recheck /dev/sda
in /etc/grub.d if a file is not executable (chmod -x ) then it won't be listed in the menu options
To remove an old kernel entry simply use synpatic/aptitude etc. to remove it, grub will auto clean itself
GRUB_HIDDEN_TIMEOUT_QUIET=true true - No countdown is displayed. The screen will be blank. false - A counter will display on a blank screen for the duration of the GRUB_HIDDEN_TIMEOUT value.
If the user presses the SHIFT key to display the menu, the menu will be displayed for the number of seconds designated by the GRUB_TIMEOUT value unless the user again intervenes.
The menu will be hidden unless the user adds a # symbol to the beginning of this line ( # GRUB_HIDDEN_TIMEOUT=0 ) and the GRUB_TIMEOUT value is greater than 0.