Change the new partition UUID (one you pasted), use `blkid` to show list.
`tune2fs -U `uuidgen` /dev/sdb1`
to change uuid, recheck with blkid
fix the newly fstab (/etc/fstab) to point correct UUID as / mount in the new partition
reinstall grub (sudo update-grub) and recheck it point the correct UUID to your new partition
you can check and boot to your new partition. And delete & reinstall boot loader in the new partition (but i choose to keep mine) link is here https://help.ubuntu.com/community/MovingLinuxPartition step6