You need to edit /etc/default/grub instead.
/usr/share/grub/default/grub is a pristine copy used internally by the
packaging - you shouldn't edit it directly.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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uncoment GRUB_DISABLE_LINUX_RECOVERY="true" && update-grub does not work, still
have recovery-mode in boot menu
https://bugs.launchpad.net/bugs/659157
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