I have the same issue. It was working fine a month ago. I wrote a cookbook with chef to install BDR a month ago since then I did not change the cookbook but now I got this error.
This seem to be the heart of the issue:
Removing obsolete dictionary files:
==> ldev4: * No PostgreSQL clusters exist; see "man pg_createcluster"
==> ldev4: /usr/share/postgresql-common/maintscripts-functions: line 95: db_stop: command not found