[SOLVED] Grub error entering rescue mode unknown file system

[balasubramaniam.r.2010.ece]

I am unable to boot from DVD or USB i tried with Windows Os and Linux Ubuntu 14 system not boot from DVD or USB I checked the boot setting everything is fine

 

[Alabalcho]

If all you get is GRUB menu / errors, this means you are still booting from non-operational internal drive of your computer. Make sure your DVD is properly prepared (eg, you don't just copy ISO file to it, you burn ISO image).

As a side note: Ubuntu 14 is pretty old (albeit still supported). If you need LTS system, go with 18.04