I resolved it by moving the files from liveCd (/usr/lib/grub/i386-pc) to /boot/grub and it works flawlessly.
Probably this issue was because neither post-install nor me invokes update-grub after updating.
I resolved it by moving the files from liveCd (/usr/lib/ grub/i386- pc) to /boot/grub and it works flawlessly.
Probably this issue was because neither post-install nor me invokes update-grub after updating.