New menu.lst on Grub version 2

[Tom H]

> Also note that the file to edit for grub options is
> now /etc/default/grub (splash,quiet,timeout etc.). Then, of
> course, run update-grub. It should survive a grub2 upgrade or at least
> give you the option to choose between your customized version or the
> new one.

True. But these options seem to apply to the 10... section.

If both GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT are "",
Ubuntu has ro on its linux line (added by 10...) and Fedora does not
(not added by 30...).

If either of the above /etc/default/grub entries is "ro", Ubuntu ends
up with "ro ro" and Fedora is unchanged.

Maybe other options apply to 30....