Unable to install deb files... Not asking for password.

[Hil]

When downloading a deb file to be installed with the new software-center... The install will fail because "not enough rights"... Of course it does not have enought rights because it does not prompt me for a password to authenticate.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: software-center 13.10-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
CurrentDesktop: GNOME
Date: Sat Apr 19 22:22:24 2014
ExecutablePath: /usr/share/software-center/software-center
InstallationDate: Installed on 2014-04-18 (1 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)