Unable to change grub menu entries because of grub customizer not working

[wongs]

You may wish to consider Option B in my post here:

Grub conflicts with grub-customizer

No GUI alternative as far as I know. A. The standard way is to edit the /etc/default/grub file. https://www.howtogeek.com/196655/how-to-configure-the-grub2-boot-loaders-settings/ Some possibilities: change the “GRUB_DEFAULT=” line so it points not at the first entry (number = 0) in the grub menu, but at a specific entry (menu line number minus 1) change the “GRUB_DEFAULT=” line to the “GRUB_DEFAULT= saved” so that it will auto boot the last selected menu entry if there is no manual input b…

Creating your own custom entries in custom.cfg