Error mounting /dev/sdd1 at /media/ubuntu/Ubuntu 16.04.1 LTS amd64: Command-line `mount -t "iso9660" -o "uhelper=udisks2,nodev,nosuid,uid=999,gid=999,iocharset=utf8,mode=0400,dmode=0500" "/dev/sdd1" "/media/ubuntu/Ubuntu 16.04.1 LTS amd64"' exited with non-zero exit status 32: mount: /dev/sdd1 is write-protected, mounting read-only
mount: /dev/sdd1 is already mounted or /media/ubuntu/Ubuntu 16.04.1 LTS amd64 busy