Removing dash (0.5.8-2.10) ...
Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
dpkg-divert: error: rename involves overwriting '/bin/sh' with
  different file '/bin/sh.distrib', not allowed
dpkg: error processing package dash (--remove):
 installed dash package pre-removal script subprocess returned error exit status 2