move ubuntu to new disk ( co-exist with old disk )

old root on sdaX, new root on nvme0n1pX 
( ps. current boot in sdbX )

 1. dd if=/dev/sdaX of=/dev/nvme0n1pX bs=1M 

2. e2fsck -f /dev/nvme0n1pX

3. tune2fs -U new-uuid /dev/nvme0n1pX

4. modify etc/fstab with new-uuid in /dev/nvme0n1pX

5. modify boot/grub/grub.cfg in /dev/nvme0n1pX

6. update-grub

第 4 忘了做, 結果還是進了舊硬碟, 第 5 則是不知道要做, 搞半天才搞清楚