sudo apt-get -f install command at terminal and downloaded about 351 MB of fixes, I restarted Ubuntu 16.04 OS but after selecting "Ubuntu" From Windows Boot Menu (Default OS : Windows 10) and then selecting ubuntu from GRUB menu, screen hanged at purple-orange wallpaper - one which is shown in GRUB menu, something like this image:Grub Boot loader Menu and caps lock key was continuously blinking .
I restarted by holding power key for 5 Seconds and then again selected "Ubuntu" from Windows Boot Loader and selected
Advanced Options from GRUB Menu and then
recovery mode (I don't know what's written after that) and after in DOS like screen after all the commands were loaded automatically, an error was shown :
end Kernel Panic - not synced Requested init/sbin/upstart failed (error-2)
Operating systems installed:
Windows 10 64 bit ,Windows 8.1 64 bit , Ubuntu 16.04 LTS 64 bit
Laptop has BIOS, not UEFI.
More Info: PC Specs screenshot taken from windows 8.1
Thanks in advance