grub.cfg read only

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http://www.linuxforums.org – I have installed Ubuntu 9.10 as a dual boot with 9.04. I would like to edit the grub config file to get rid of all the superfluous menu entries and put the 9.04 entry before the 9.10 one. With 9.04 I can edit menu.lst as sudo gedit menu.lst and save it. When I sudo gedit grub.cfg I am no allowed to save the file. I get "You are trying to save to a read only disk" error. How can I get the grub folder to be R/W just for the editing session? (HowTos)