_ [vdr] mackerel-agent 0.23.0-1

これはちょっと。
Setting up mackerel-agent (0.23.0-1) ...

Configuration file '/etc/mackerel-agent/mackerel-agent.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** mackerel-agent.conf (Y/I/N/O/D/Z) [default=N] ? dpkg: error processing package mackerel-agent (--configure):
 EOF on stdin at conffile prompt
Errors were encountered while processing:
 mackerel-agent
E: Sub-process /usr/bin/dpkg returned an error code (1)