> efibootmgr: Could not set variable Boot0003: Input/output error
> efibootmgr: Could not prepare boot variable: Input/output error
Points to an EFI variable firmware issue most likely.
You can manually try deleting boot entries and re-running, but there
isnt much GRUB can do here
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1557125
Title:
package grub-efi-amd64 2.02~beta2-22ubuntu1.5 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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