I have seen in Debian that quite a few packages are virtual packages. Why do such virtual packages exist ?
for e.g. :-
$ aptitude show pppoeconf Package: pppoeconf State: installed Automatically installed: no Version: 1.21 Priority: optional Section: net Maintainer: Gregory Colpart <email@example.com> Architecture: all Uncompressed Size: 297 k Depends: whiptail-provider | whiptail, ppp (>= 2.4.2+20040428-2) | pppoe (>= 3.0), ppp (>= 2.4.1.uus2-4), gettext-base (>= 0.13), sed (>= 3.95), ifupdown (>= 0.7.44~), iproute2 Recommends: locales Suggests: xdialog Description: configures PPPoE/ADSL connections User-friendly tool for initial configuration of a DSL (PPPoE) connection.
See the suggests :-
Now let's try to see it a little closer -
$ aptitude show xdialog No current or candidate version found for xdialog Package: xdialog State: not a real package
Why is it there ? One could it, it was a real package in say wheezy or jessie and then it was removed. Could this be the only reason or are there possibilities of more reasons ?
The above I have just taken as an example.