apt error affecting debian-installer now fixed

[∅]

more on the backstory here:
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1380774

Lubuntu can now get to testing on the Alternate images!
http://iso.qa.ubuntu.com/qatracker/milestones/325/builds
I've taken care of Lubuntu Alternate i386 guided myself to confirm
this bug fix on 20141017.1 :)

Ubuntu Server 20141017 does NOT have the fix. I'll leave it to the
Ubuntu Release Team to take care of that one.

wxl