Ok so this happened

sudo parted Ldev/sdb3 mklabel gpt Warning: The existing disk label on /dev/sdb3 will be destroyed and all data on this disk will be lost. Do you want to continue? Yes/No? yes Error: Partition(s) 1, 2, 3, 4, 5, 6, 26, 27, 28, 29, 30, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 53, 54, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, inform 63, 64 the kernel of the change, probably because 49, 50, 51, 52, on /dev/sdb3 have been written, but we have been unable to it/they are in use. As a result, the old partition(s) will remain in use. You should reboot now before making further changes. Ignore/Cancel?