When using apt-cache to find the reverse depends of a package
Use apt-cache rdepends <package>
Or for the dependencies of a particular package use apt-cache depends <package>
it would only show dependencies for packages in repositories that you have added wouldn't it?
You add an entry in your sources.list than do aptitude update
,then the new packages should be available to you.
In some instances you may need to install a 'keyring' for the appropriate repository also.
Apt -update updates the list of packages that need to be updated.
Apt -upgrade upgrades the necessary packages.
Debian advocates the use of Aptitude now and has done since Etch went Stable.
So the way to upgrade now is:
Or a more 'aggressive' upgrade installing new libs to satisfy dependencies use:
You can still use apt-get of course.