Using --force-all with dpkg is a horrible idea. In most cases, if dpkg prevents you from doing something, it's that there's a reason to it… In this case it's mostly harmless since it didn't break anything and simply resulted in an unusable install of Dolphin, but who knows what might happen with other packages.
Even dpkg itself says this.
The dependencies do seem to be a bit broken for 15.10 (whereas they used to be fine for 15.04). I'd suggest using the PPA instead so you have no dependency issue and have an always up-to-date Dolphin build:
(source: https://wiki.dolphin-emu.org/index.php?title=Installing_Dolphin#Ubuntu)
Even dpkg itself says this.
Code:
dpkg forcing options - control behaviour when problems found:
Forcing things:
[!] all Set all force options
[...]
WARNING - use of options marked [!] can seriously damage your installation.The dependencies do seem to be a bit broken for 15.10 (whereas they used to be fine for 15.04). I'd suggest using the PPA instead so you have no dependency issue and have an always up-to-date Dolphin build:
Code:
sudo add-apt-repository ppa:dolphin-emu/ppa
sudo apt-get update
sudo apt-get install dolphin-emu-master