daknob@server:~$ sudo aptitude why adwaita-icon-theme
p   vim-gtk3   Provides vim
p   vim-gtk3   Depends  libgtk-3-0 (>= 3.21.5)
p   libgtk-3-0 Depends  adwaita-icon-theme
daknob@server:~$ aptitude why libgtk-3-0
p   vim-gtk3 Provides vim
p   vim-gtk3 Depends  libgtk-3-0 (>= 3.21.5)
daknob@server:~$ aptitude why vim-gtk3 # vim-gtk3 is not going to be installed with aptitude install freeradius
i   vim-common Recommends vim | vim-gtk | vim-gtk3 | vim-athena | vim-nox | vim-tiny