Hello
Thanks for replying @wizardfromoz
I'm using windows 10 version 1809 and yes I have an Ubuntu disk for rescuing.
I had downloaded Zorin os 12.3 and my Acer aspire e5 specs are
Intel Core i5 6200u
8gb ddr4 ram
1tb HDD
Nvidia 940mx
No, I couldn't see a grub menu after I installed Zorin and I...