I am currently using an ASUS K53SC machine (laptop).
I tried installing Ubuntu 17.10 (dual boot with windows 10) december last year, however, after installation completion the machine directly booted to windows 10. Also, on restart there was no option to boot to Ubuntu 17.10.
Additionally, I tried the installation again from USB via the BIOS, however, although the USB would show up, I was unable to boot from it (gets stuck at a black screen).
In the meanwhile, I have formatted the Ubuntu drive and windows 10 works normally. I tried updating the machine BIOS (read some suggestions on the internet) to fix the boot issue, however, still no success.
Now, I am left with current windows 10, and am unable to install any ubuntu version (unable to boot from USB via BIOS).
Any suggestions on how to fix this, except for replacing the motherboard, would be appreciated.