I'm not sure. I think I would try to restore a normal G2 setup, at least initially.
Close Grub Customizer, if it is open.
Open a file browser as root (gksu nautilus /etc/grub.d) and move any file in that folder named "*.proxy" to the Desktop or somewhere else.
Next move any files in "/etc/grub.d/proxifiedScripts" folder back into /etc/grub.d These files are the originals which GC used to make the *.proxy files. Restoring them to the /etc/grub.d folder should return G2 to normal.
Once you have no files in /etc/grub.d named *.proxy, try running "sudo update-grub" and see if it now works. You will have lost any GC customizations but at least have restored normal G2 functionality for the time being.
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