I'm trying to install the Nitro task application, but I keep getting "Missing dependencies". I try to apt-get the dependencies and I get:
Package gir1.2-launchpad-integration-3.0 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'gir1.2-launchpad-integration-3.0' has no installation candidate
How do I fix a problem like this?