Hello, There is a mistake in official 4.5.1 distribution. According to documentation update should be done from:
deb http://cloudstack.apt-get.eu/ubuntu precise 4<http://cloudstack.apt-get.eu/ubuntu%20precise%204>.5 If you go there you’ll find that primary file has 0 length Packages 2015-04-30 12:23 0 Ubuntu users can’t update, because there is no packages specified. Shapeblue repo works good. Regards, Vadim