Using Aspire laptop dual-booted Ubuntu 18.04 and Windows 7. Can't boot from CDROM or USB when in Ubuntu but both work fine in Windows.

closed as unclear what you're asking by Rui F Ribeiro, RalfFriedl, GAD3R, Mr Shunz, Jeff Schaller Jan 13 at 15:26

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    What happens when you "cannot boot"? Do you see an error message, or does the startup sequence go directly to the hard drive? Have you checked your BIOS boot priority? – Reinderien Jan 13 at 1:14
  • Startup sequence does not start at all, does not go to hard drive, screen is blank not even a flashing cursor. BIOS boot priority checked, OK. – RayArdia Jan 14 at 23:18