I changed the repos from Trusty to Utopic (I didn't upgrade any package), and the terminal shows these errors:
$ update-manager
Error loading .desktop file /usr/share/applications/gnome-activity-log-manager-panel.desktop: constructor returned NULL
Error loading .desktop file /usr/share/app-install/desktop/activity-log-manager:gnome-activity-log-manager-panel.desktop: constructor returned NULL
Error loading .desktop file /usr/share/applications/gnome-deja-dup-panel.desktop: constructor returned NULL
Error loading .desktop file /usr/share/app-install/desktop/deja-dup:gnome-deja-dup-panel.desktop: constructor returned NULL
Error loading .desktop file /usr/share/app-install/desktop/signon-ui:signon-ui-browser-process.desktop: constructor returned NULL
Error loading .desktop file /usr/share/app-install/desktop/unity-control-center-signon:update-accounts.desktop: constructor returned NULL
everything works, though
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
GsettingsChanges:
com.ubuntu.update-manager show-details true
com.ubuntu.update-manager window-height 744
com.ubuntu.update-manager first-run false
com.ubuntu.update-manager window-width 1301
com.ubuntu.update-manager launch-time 1412532109
InstallationDate: Installed on 2014-10-05 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
Package: update-manager 1:0.196.12
PackageArchitecture: all
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Tags: trusty
Uname: Linux 3.13.0-37-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
apport information