I'm trying to dual boot my PC which already has Windows 10 installed (in UEFI mode) with Ubuntu. I'm aware that I have to install Ubuntu in the UEFI mode in order to avoid the hassle later. I have followed the instructions precisely from the article Dual boot Win 10 with Ubuntu. As of now, I have done the following steps:
1. Created a live USB with bootable Ubuntu
2. Changed boot priority to USB HDD drive in boot menu
3. Disabled fast startup
4. Disabled secure boot from BIOS
I have also tried booting from USB option from within Windows itself either with PC Setting (like for UEFI) or pressing shift key while clicking on Restart as mentioned in the article. However, whenever my PC restarts, instead of showing me the options to install Ubuntu, I get an error
"System doesn't have any USB boot system. Please select other option in boot manager.".
I'm using Acer Spin 7 model with 4GB RAM, Core i7 processor and 256GB HDD. I couldn't find the solution of the specific problem as mine in the internet. Any help or suggestions would be highly appreciated. Thank you in advance.