I had a similar issue recently
Die folgenden Pakete haben unerfüllte Abhängigkeiten:
libgegl-0.3-0 : Hängt ab von: libopenraw1v5 (>= 0.0.9) ist aber nicht installiert
An "apt-get -f install" didn't help, but after I followed michaaa62's hint the DU completed.
dpkg -r libopenraw1 libgegl-0.2-0
apt-get install libopenraw1v5 libgegl-0.3-0
But there is still another issue, don't know if it's related with that:
After login in lightdm the screen becomes black and then the loginsceen appears again.
the .xsession-errors says:
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
This application failed to start because it could not find or load the Qt platform plugin "xcb".
Available platform plugins are: linuxfb, minimal, minimalegl, offscreen.
Reinstalling the application may fix this problem.
I installed xcb but it didn't solve it.
Btw, I use kdenext