rich@rich-HP-ProDesk-400-G3-SFF:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=56e67918-4618-4a2d-9920-5abe6251da07 /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=8EF8-725D  /boot/efi       vfat    defaults        0       1
# swap was on /dev/sda3 during installation
UUID=9bb0f01c-214f-4726-8d6e-c515cf4eec79 none            swap    sw              0       0

# Added by RJE 16/07/2016 to get the stuff I want mounted
//192.168.69.66/maindata /mnt/maindata/ cifs user=danearle,password=.........,rw,dir_mode=0777,file_mode=0777,gid=staff,uid=rich 0 0
//192.168.69.66/utilities /mnt/utilities/ cifs user=danearle,password=.......,rw,dir_mode=0777,file_mode=0777,gid=staff,uid=rich 0 0
//192.168.69.66/Ftp_webs /mnt/ftp_webs cifs user=danearle,password........,rw,dir_mode=0777,file_mode=0777,gid=staff,uid=rich 0 0

rich@rich-HP-ProDesk-400-G3-SFF:~$
rich@rich-HP-ProDesk-400-G3-SFF:~$ umount -a
umount: only root can use "--all" option
rich@rich-HP-ProDesk-400-G3-SFF:~$ sudo umount -a
[sudo] password for rich:
umount: /run/user/1000: target is busy    <<< When locked this is what it does
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)
^Z^Z
[1]+  Stopped                 sudo umount -a
rich@rich-HP-ProDesk-400-G3-SFF:~$ fg
sudo umount -a


^C
rich@rich-HP-ProDesk-400-G3-SFF:~$