ARM - daily install to SDCARD

[Elfy]

Trying to install to sdcard - it sees the free space - allows me to 
create partition/s as required.

Then the install fails after trying to unmount /cdrom

As far as mount is concerned the image is mounted on /cdrom

Not sure how to proceed with this.

Created this bug 
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1036742

But I'm pretty sure I've seen this trying to install with usb medium and 
alternate cd

Elfy