Debian [lenny]

apt-get upgrade mplayer
The following packages have been kept back:
  mplayer

apt-get -f install  mplayer
The following packages have unmet dependencies:
  mplayer: Depends: libgtk2.0-0 (>= 2.12.0) but 2.10.13-1 is to be installed

apt-cache showpkg libgtk2.0-0
Package: libgtk2.0-0
Versions:
2.10.13-1 (/var/lib/apt/lists/ftp.debian.org_debian_dists_lenny_main_binary-i386_Packages) (/var/lib/apt/lists/ftp.it.debian.org_debian_dists_lenny_main_binary
-i386_Packages) (/var/lib/dpkg/status)

Reverse Depends:
  mplayer,libgtk2.0-0 2.10.12-3