Comment 1 for bug 1210254

State afterwards:
# dpkg -l|grep landscape-c
iU landscape-client 13.07.1-0ubuntu1 amd64 The Landscape administration system client
ii landscape-client-ui 12.12-0ubuntu3 amd64 The Landscape administration system client - UI configuration
iU landscape-client-ui-install 13.07.1-0ubuntu1 amd64 The Landscape administration system client - UI installer
iU landscape-common 13.07.1-0ubuntu1 amd64 The Landscape administration system client - Common files

A subsequent apt-get -f install fixes it, but if you are using landscape to manage this computer you are in trouble, because the client isn't running anymore.
# apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following package was automatically installed and is no longer required:
  gir1.2-gudev-1.0
Use 'apt-get autoremove' to remove it.
The following extra packages will be installed:
  landscape-client-ui
The following packages will be upgraded:
  landscape-client-ui
1 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
3 not fully installed or removed.
Need to get 0 B/21.6 kB of archives.
After this operation, 3,072 B of additional disk space will be used.
Do you want to continue [Y/n]?
(Reading database ... 57548 files and directories currently installed.)
Preparing to replace landscape-client-ui 12.12-0ubuntu3 (using .../landscape-client-ui_13.07.1-0ubuntu1_amd64.deb) ...
Unpacking replacement landscape-client-ui ...
Processing triggers for libglib2.0-0:amd64 ...
Setting up landscape-common (13.07.1-0ubuntu1) ...
Setting up landscape-client (13.07.1-0ubuntu1) ...
landscape-client is not configured, please run landscape-config.
Setting up landscape-client-ui-install (13.07.1-0ubuntu1) ...
Setting up landscape-client-ui (13.07.1-0ubuntu1) ...
Installing new version of config file /etc/dbus-1/system.d/landscape.conf ...