So in version 16.04 is is the same thing.......
When i want to wirite some thing in the partition  /dev/sda1 witch is mounted 
on /cdrom
ubuntu@ubuntu:~$ sudo mount|grep sda1
/dev/sda1 on /cdrom type vfat 
(ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
ubuntu@ubuntu:~$

witch it contains
ubuntu@ubuntu:~$ ls /cdrom
boot     ldlinux.c32  preseed             SmartClean.ini
casper   ldlinux.sys  README.diskdefines  syslinux
dists    md5sum.txt   $RECYCLE.BIN        System Volume Information
EFI      pics         Remove_LiLi.bat
install  pool   

i can't dismount the partition and remount to write /EFI/ubuntu  on this 
partition.
ubuntu@ubuntu:~$ sudo umount /cdrom
umount: /cdrom: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)
ubuntu@ubuntu:~$ sudo lsof +D /cdrom
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/999/gvfs
      Output information may be incomplete.
ubuntu@ubuntu:~$ sudo fuse /cdrom
sudo: fuse: command not found
ubuntu@ubuntu:~$ sudo fuser /cdrom
ubuntu@ubuntu:~$ sudo fuser -v /cdrom
                     USER        PID ACCESS COMMAND
/cdrom:              root     kernel mount /cdrom
ubuntu@ubuntu:~$ sudo umount -lv /cdrom
umount: /cdrom (/dev/sda1) unmounted
ubuntu@ubuntu:~$ sudo ls /cdrom
ubuntu@ubuntu:~$ sudo mkdir /mnt/A
ubuntu@ubuntu:~$ sudo mount -v /dev/sda1 /mnt/A
mount: /dev/sda1 is already mounted or /mnt/A busy
ubuntu@ubuntu:~$

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https://bugs.launchpad.net/bugs/476072

Title:
  Installation impossible when partition mounted on HD

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