This isn't a bug with dpkg rather there is something wrong with the files provided by the package libmono-sy3tem-xml4.0-cil which has corrupted your /var/lib/dpkg/status file.
This isn't a bug with dpkg rather there is something wrong with the files provided by the package libmono- sy3tem- xml4.0- cil which has corrupted your /var/lib/ dpkg/status file.