[Bartender]

Yeah, I know what you mean - I do some stuff at work, some on the Linux PC, most on the Windows PC - do you have a USB thumb drive? You can use OpenOffice to move documents back and forth. On the Linux PC, swipe the file, copy it, then open OO Writer and paste the text. Save the file to your thumb drive, unmount it, take it over to the Windows PC, etc. etc. Same thing works in reverse.
There are probly easier ways to do it...

[saikee]

/boot/grub/menu.lst is a system file which requires root privilege to edit. Thus preceeding a terminal command "sudo" or issuing "su" followed by root password is needed in Ubuntu.

The editor universally available in every Linux is "vi" which can be hard to use without a reference manual.

[GripS]

Since you won't be changing a whole lot here are some basic commands that can easily do the job:

navigate with the arrow keys

i -- insert into (for entering text)

r -- replace with (so if you want to replace and 'e' with an 'a' or a '0' to '1')

x -- deletes the character the cursor is on

:wq! -- write and save file ( :x works as well )

IMPORTANT 'ESC' Key before doing anything. So going from 'insert' mode to using 'x' for delete be sure to hit 'esc' first. I do it out of habit all the time when i don't need to because i forced myself to use it. vi can be damaging if you screw up.

:q! -- quit without writing (use this when you screw up or are unsure if you want to save)

Might be a good idea to make a backup of all files you modify before using vi. This is where the 'cp' (copy) command comes in. 'cp {file name} {file name.bak}'. That way if you mess up the file you were in vi on you can just do the reverse 'cp {file name.bak} {file name}'.