I copied my hdd to ssd with ddrescue it worked earlier but didn't work this time why?

Question

I generally use this command sudo ddrescue /dev/sda /dev/sdb --force to clone my hdd ubuntu to ssd and the ssd would boot and work like a charm but .. this time the new ssd drive is not booting. does have to do with the file system in target ssd doesn't ddrescue or dd do a complete clone including file system and all.What can I do to clone my harddrive to ssd make that ssd a fully independent bootable disk;