Removing postgresql (9.4+166bzr2) ...
Removing postgresql-9.4 (9.4.3-0ubuntu0.15.04) ...
Purging configuration files for postgresql-9.4 (9.4.3-0ubuntu0.15.04) ...
Dropping cluster main...
Insecure directory in $ENV{PATH} while running with -T switch at /usr/bin/pg_dropcluster line 66.
dpkg: error processing package postgresql-9.4 (--purge):
 subprocess installed post-removal script returned error exit status 2