Thank you for the report, the error is
Apr 9 20:36:03 ubuntu grub-installer: info: Running chroot /target grub-install --force --target x86_64-efi "/dev/sda" Apr 9 20:36:03 ubuntu grub-installer: Installing for x86_64-efi platform. Apr 9 20:36:14 ubuntu grub-installer: grub-install: error: cannot copy `/usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed' to `/boot/efi/EFI/ubuntu/grubx64.efi': No space left on device.
It seems the EFI partition hasn't the space needed
Thank you for the report, the error is
Apr 9 20:36:03 ubuntu grub-installer: info: Running chroot /target grub-install --force --target x86_64-efi "/dev/sda" grub/x86_ 64-efi- signed/ grubx64. efi.signed' to `/boot/ efi/EFI/ ubuntu/ grubx64. efi': No space left on device.
Apr 9 20:36:03 ubuntu grub-installer: Installing for x86_64-efi platform.
Apr 9 20:36:14 ubuntu grub-installer: grub-install: error: cannot copy `/usr/lib/
It seems the EFI partition hasn't the space needed