On November 3 there was an update on the Launchpad PPA repository from 1.26.4-2 to 1.26.4-3. If you have installed Zoneminder before this date you can do an upgrade to the new version with: apt-get update then apt-get upgrade. The install script will try to stop your Zoneminder but it is a good idea to stop it beforehand.
Link to my How-To:
http://www.zoneminder.com/wiki/index.ph ... e_easy_way