Although the bug is a bit different, the workaround in the bug below is
quite generic. Maybe you could try it or adapt it to your needs:

I hope this helps, regards,

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  The ubuntu 18.04 installer went through the installation process and
  then suddenly halted, said I cannot install the grub bootloader. Looks
  like I am cooked. My machine is useless without an operating system. I
  did not even keep my older ubuntu 14.04  installation.

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