I am new to ubuntu. I tried installing 14.04 as dual boot with windows 10 on dell xps 13. It wasn't completely working, so I decided to install instead 15.10. I removed the ubuntu partition from inside windows 10. I made a bootable usb with 15.10 and then tried reinstalling. Couple of issues.
- On rebooting, the usb is not visible.
- The secure boot option is enabled in UEFI.
- ubuntu is still there in the bootup screen.
- When I power down and start, grub comes up.
What do I need to do to clean out the precious ubuntu and reinstall?
Edit to answer the question: In the BIOS Setup, boot from USB had to be added. This is done by restarting the machine with the USB installed, pressing F12 (at least on the Dell I have) to get into the boot menu, and then going into the BIOS Setup to add the boot from USB as an option