181+deb9u1) is not available, but a newer one is (
181+deb9u2). We redirected you there.
/usr/share/postgresql-common/t/002_existing_clusters.t is in postgresql-common 181+deb9u2.
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# Check that no clusters and postgres processes are present for this test. use strict; use Test::More tests => 10; use lib 't'; use TestLib; check_clean; # vim: filetype=perl