A Startup Repair is done from the Recovery Media. It has been a while since I have used any of those options, but it may need to be done up to 3 times, and 4 times if Linux was involved.
The message is saying it is not finding a bootable device.. Resetting your drive's priority in the Bios may help or you may need to reset the boot file for the system. Depending on how far the upgrade progressed, your system may be in an undetermined state due to a partial install, but you would know best about that situation.