Ubuntu 21.1 dual boot installation

I am getting a “Unable to Install GRUB in /dev/sda” message. The computer is an older 64 bit HP computer and it already has Windows 10 installed

Does anyone have any idea what exactly this means, other than it is a fatal error, and how can I fix it?

Thanks in advance for any assistance that can be provided!


Does your system have only one disk? Is it UEFI+GPT or MBR? That could make a difference. If it’s UEFI, you should have an ESP partition.

There is no one definite reason for this error. You may try a few things and reinstall it.

  • Try to disable fast boot and secure boot (for UEFI system)
  • Do not connect to network and download updates and install media codecs while installing

It had UEFI disabled.
I did not see anything about fast boot, or secure boot
I enabled UEFI and it did the same thing.
It is NOT connected to the internet.
I returned UEFI to disabled
I tried to do a minimal installation and it failed

There is ONLY 1 disk, but since it is dual boot, it is partitioned

Any other ideas?

Do a screenshot using Gparted and post your partition layout.