running mythbuntu 10.04 (well, trying to)

I have some vmalloc related errors. All the links I find say to edit the /boot/grub/menu.lst file - but I don't have one. I made this change before in 9.04. Has /boot/grub/menu.lst file been replaced by something else in 10.04? The grub.cfg file looks like what I edited in the past, but it clearly says "do not edit this file".

The main vmalloc page,

http://www.mythtv.org/wiki/Common_Pr...lloc_too_small

says this can also be added to the /etc/default/grub file. I tried this as described, but it doesn't "take" (when checking the /proc/meminfo file), it's still the original amount of memory.