[ovirt-users] ovirt 4.1 : Can't install guest tools for Zentyal 5.0 (based on ubuntu 16.04 xenial)

Hi all, I have this problem: I'm tring to install the guest tools following this guide: https://www.ovirt.org/documentation/how-to/guest-agent/install-the-guest-... This is the sources: deb http://it.archive.ubuntu.com/ubuntu/ xenial main restricted deb http://it.archive.ubuntu.com/ubuntu/ xenial-updates main restricted deb http://it.archive.ubuntu.com/ubuntu/ xenial universe deb http://it.archive.ubuntu.com/ubuntu/ xenial-updates universe deb http://it.archive.ubuntu.com/ubuntu/ xenial multiverse deb http://it.archive.ubuntu.com/ubuntu/ xenial-updates multiverse deb http://it.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse deb http://archive.zentyal.org/zentyal 5.0 main extra deb http://security.ubuntu.com/ubuntu xenial-security main restricted deb http://security.ubuntu.com/ubuntu xenial-security universe deb http://security.ubuntu.com/ubuntu xenial-security multiverse But when I try to install, I have this error: root@vmdczen01:~# apt-get install ovirt-guest-agent Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: ovirt-guest-agent : Depends: python-apt but it is not going to be installed E: Unable to correct problems, you have held broken packages. I've found that python-apt is in "main" repo: https://packages.ubuntu.com/xenial/amd64/python-apt/download So, what's the problem? Can you help me? Thank you