At this point, you know enough about aptitude to actually make modifications to your system.
You should periodically update your list of available packages from the Debian servers, to keep track of new packages and new versions of packages. To do this, press u. At any time during the download, you can press q to abort it.
Once you have fresh lists of packages, you can choose the
packages to upgrade, install, or remove as described in the
previous section. To review the actions you have requested,
press g once. When installing the
kaffeine-mozilla package (from the
previous example), the following screen appears:
As you can see, aptitude automatically decided to install
kaffeine for me because
kaffeine-mozilla requires it. At
this point, I have the choice of either continuing with the
installation by pressing g, or aborting it
by pressing q.