This looks like a GRUB installation target issue rather than a problem
with the Xubuntu install itself. The installer correctly placed the
system on sdc, but GRUB was installed to sdb instead of the disk
containing the active boot setup. Since the old Ubuntu 12.04 GRUB on sda
is still being loaded, it is not finding the new installation. A
workaround would be to reinstall GRUB from the new system and explicitly
select the correct drive (for example, using grub-install /dev/sdc if
that is where you want it), then run update-grub. It may also help to
check the BIOS boot order and ensure the intended disk is first. This
was a common issue with multi-drive installs in older Ubuntu release
https://www.changehealthcareprovider.com

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https://bugs.launchpad.net/bugs/1017172

Title:
  Grub installs to wrong drive

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