Some information for understanding your problem is missing:
* Which image did you use for the installation?
* Do you have UEFI enabled?
* Did you select MBR or GPT partitioning?
* Which drives exist in the laptop?
* Is the master boot record locked in the BIOS?
** Changed in: grub (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1968603
Title:
grub-install /dev/sda failed. I'm istalling ubuntu 20.04
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