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sudo apt-get install libnunit2.5-cil

Reading package lists... Done

Building dependency tree      

Reading state information... Done

libnunit2.5-cil is already the newest version.

0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

5 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Do you want to continue [Y/n]? y

Setting up libnunit2.5-cil (2.5.10.11092+dfsg-1) ...

* Installing 5 assemblies from libnunit2.5-cil into Mono

 

Unhandled Exception: System.MissingMethodException: Method not found: 'System.Reflection.PropertyInfo.op_Equality'.

  at Mono.Tools.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0

[ERROR] FATAL UNHANDLED EXCEPTION: System.MissingMethodException: Method not found: 'System.Reflection.PropertyInfo.op_Equality'.

  at Mono.Tools.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0

E: installing Assembly /usr/lib/cli/nunit.core-2.5/nunit.core.dll failed

E: Installation of libnunit2.5-cil with /usr/share/cli-common/runtimes.d/mono failed

dpkg: error processing libnunit2.5-cil (--configure):

 subprocess installed post-installation script returned error exit status 29

E: Sub-process /usr/bin/dpkg returned an error code (1)