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How to fix "error while installing package installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10"

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I have an ASUS ROG laptop which used to run Windows 10, before I installed Ubuntu onto it. This is NOT a dual-boot laptop, but it having used to run windows might be a problem (see this.) I was installing a graphics card driver update, when I got this error: error listed in question title. (please look at the image i beg of you)

I was also installing something from the snap store when I got the same error. Should I just reinstall Windows?

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