I have been able to install Grub-customize on different versions of Ubuntu and Linux Mint. However in Ubuntu version 20.04, it says that the repository is not secure and does not allow installation.
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1We will likely need more details. You should copy/paste the entire error as well as detail all of the steps needed to reproduce the error. Include all commands you've used. – Nmath Apr 22 '22 at 20:36
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@Nmath No additional details are required. In Ubuntu 20.04 just run `sudo apt install grub-customizer` to install the grub-customizer package from the default Ubuntu repositories. – karel Apr 23 '22 at 01:08