GRUB default, how to change?

[PM]

I don't know would there be any harm in installing grub customizer from
launchpad after adding PPA? As it says that PPA addition could not be a
trusted one as it is not from the Ubuntu repositories. It depicts as
follows:

"*Important:* The contents of Personal Package Archives are not checked or
monitored. You install software from them at your own risk."

https://launchpad.net/%7Edanielrichter2007/+archive/grub-customizer

So should this be used?
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