February 2020
Intermediate to advanced
666 pages
15h 45m
English
Content preview from Mastering Linux Security and Hardening - Second Edition
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Disabling the submenu for Ubuntu
Theoretically, you can disable the Ubuntu submenu by placing GRUB_DISABLE_SUBMENU=true in the /etc/default/grub file and then running sudo update-grub. However, I couldn't get that to work, and according to the results of my DuckDuckGo searches, neither can anyone else. So, we'll manually edit the /boot/grub/grub.cfg file to fix that.
Look for the submenu line that appears just after the first menuentry item. It should look like this:
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-f0f002e8-16b2-45a1-bebc-41e518ab9497' {
Comment out that line to make it look like this:
# submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-f0f002e8-16b2-45a1-bebc-41e518ab9497' ...