mount: /dev/sdb1 is already mounted or /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/boot busy
       /dev/sdb1 is already mounted on /mnt/boot
       /dev/sdb1 is already mounted on /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/boot