Boost.Python error in job "bootloader".
<class 'subprocess.CalledProcessError'>
Command 'grub-install --target=i386-pc --recheck --force /dev/sda' returned non-zero exit status 1
Traceback:
  File "/usr/lib/calamares/modules/bootloader/main.py", line 289, in run
    prepare_bootloader(fw_type)

  File "/usr/lib/calamares/modules/bootloader/main.py", line 277, in prepare_bootloader
    install_grub(efi_directory, fw_type)

  File "/usr/lib/calamares/modules/bootloader/main.py", line 248, in install_grub
    boot_loader["installPath"]])

  File "<string>", line 2, in <module>