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Processing triggers for software-center ...
/usr/lib/pymodules/python2.7/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display
  warnings.warn(str(e), _gtk.Warning)
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Setting up libnunit2.4-cil (2.4.7+dfsg-6) ...
* Installing 6 assemblies from libnunit2.4-cil into Mono

** (/usr/lib/mono/2.0/gacutil.exe:7738): WARNING **: The class System.Collections.Generic.Dictionary`2 could not be loaded, used in mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Unhandled Exception: System.TypeLoadException: Could not load type 'Mono.Tools.Driver' from assembly 'gacutil, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
E: installing Assembly /usr/lib/cli/nunit.core-2.4/nunit.core.dll failed
E: Installation of libnunit2.4-cil with /usr/share/cli-common/runtimes.d/mono failed
dpkg: error processing libnunit2.4-cil (--configure):
 subprocess installed post-installation script returned error exit status 9