Grub2 didn't install correctly, but not only on the MBR. The main file core.img is missing on /dev/sdb5. You better remove all of grub2 and reinstall again. You can do that by booting into live mode with the cd and entering your installation with chroot.
To prepare and enter with chroot:
Code:
sudo mount /dev/sdb5 /mnt
sudo mount --bind /proc /mnt/proc
sudo mount --bind /dev /mnt/dev
sudo mount --bind /sys /mnt/sys
sudo chroot /mnt
Now you are inside the installation with root permissions. Remove grub2 completely and reinstall. Recreate the config files:
Code:
apt-get remove --purge grub-pc grub-common
apt-get install grub-pc
grub-mkconfig
update-grub
grub-install /dev/sdb
That should do it. Exit the chroot and unmount everything:
Code:
exit
sudo umount /mnt/sys
sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt
Restart and set in BIOS to boot from the second disk, /dev/sdb. The first disk will continue to have windows bootloader and can boot your windows directly but not ubuntu. Grub2 will be on the second disk and can boot both.
See if that sorts it out.
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