Dual boot failure with windows 8.1


Hi All, i am a newbie to linux and try to install ubuntu mate 18.04 on a separate disk but after installation i am getting a black screen with message “Error no such partition entering rescue mode”
primary OS installed on disk 1 is windows 8.1 and Ubuntu mate is on disk 2, i had disabled fast boot in BIOS and select disk 2 for boot but same error occurs.


Did you install grub to a partition or the entire hard drive