You have either a bad disk or more likely, a bad SATA cable, and also
probably some bad ram. You should run the memtest option from the boot
menu and replace the faulty ram and SATA cable.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1782371
Title:
'grub-efi-amd64-signed' package failed to install into / target/. in
Ubuntu 18.04
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