I have run ubuntu's boot-repair and got this warning:
"The boot of your PC is in Legacy mode. You may want to retry after changing it to EFI mode."
How do I boot Intel S5520SCR to EFI mode? Is this done in the BIOS?
Yes, in BIOS > Boot Order you can set "EFI Shell and EFI Boot paths".
You can also go into the BIOS > Boot Manager, and choose to boot immediately to [Internal EFI Shell]
Thank you so much for the help.
The final solution was to have the Ubuntu live CD in the drive and then it showed up in the BIOS allowing to boot EFI from the CD.
Retrieving data ...