This still exits in 16.04 and it is impossible to install the EFI repertory in 
/EFI of this partition. However it is possible to use another partition. butn 
after finish the installation, it is not possible to copy on these partition 
because
ubuntu@ubuntu:/$ ls /cdrom
ubuntu@ubuntu:/$ sudo mount -v /dev/sda1 /mnt/A
mount: /dev/sda1 is already mounted or /mnt/A busy
ubuntu@ubuntu:/$ ls /mnt/A
ubuntu@ubuntu:/$ fuser /dev/sda1
ubuntu@ubuntu:/$

For me, this  solution is not good
See. 
http://www.hostingpics.net/viewer.php?id=449892Screenshotfrom20160521124220.png

PS: I use also a USB drive to install ubuntu.
On EFI, i have a big problem: It is necessary to replace /EFI/BOOT/bootx64.efi 
by /EFI/ubuntu/grubx64.efi for booting with an external drive. So i use 
windows10 to do this!

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https://bugs.launchpad.net/bugs/1502697

Title:
  ubuquity crashes in 15.10

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