I don't see any error relating to /cow, but I do see the following:
Oct 19 11:47:40 ubuntu grub-installer: info: Installing grub on '/dev/sda'
Oct 19 11:47:40 ubuntu grub-installer: info: grub-install does not support
--no-floppy
Oct 19 11:47:40 ubuntu grub-installer: info: Running chroot /target
grub-install --force "/dev/sda"
Oct 19 11:47:40 ubuntu grub-installer: Installing for i386-pc platform.
Oct 19 11:47:41 ubuntu grub-installer: grub-install: warning: this GPT
partition label contains no BIOS Boot Partition; embedding won't be possible.
Oct 19 11:47:41 ubuntu grub-installer: grub-install: error: embedding is not
possible, but this is required for cross-disk install.
Oct 19 11:47:41 ubuntu grub-installer: error: Running 'grub-install --force
"/dev/sda"' failed.
This seems to be an error due to the partitioning scheme used.
Could you please tell us more about what options you picked in the
installer, and how you did the partitioning?
Thanks!
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1798810
Title:
installer crashes after failing to install bootloader
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