Comment 2 for bug 1309387

While not the best example (as it's in the repos), a simple example of failure with a nautilus-actions .deb -

Selecting previously unselected package nautilus-actions.
(Reading database ... 184849 files and directories currently installed.)
Preparing to unpack .../nautilus-actions_3.2.3-1_amd64.deb ...
Unpacking nautilus-actions (3.2.3-1) ...
dpkg: dependency problems prevent configuration of nautilus-actions:
 nautilus-actions depends on libunique-3.0-0 (>= 2.90.1); however:
  Package libunique-3.0-0 is not installed.

dpkg: error processing package nautilus-actions (--install):
 dependency problems - leaving unconfigured