Hello, I downloaded and installed a new theme for grub2. Also I used a program called Grub Customizer. I edited a bit the pics of the new theme and saved.
Then I rebooted, and saw the default ubuntu mate theme. I went to check grub.cfg and noticed that it has all the necessary information about the new theme. I did sudo update-grub anyway, to make sure it worked. I rebooted again, and still I saw the default theme.
Why cant I change it? Grub.cfg clearly stated that the new one is in use, with all other settings I chose in Grub Customizer, for example the seconds that it shows the menu etc.