Failure upgrading PG 9.2 to 9.3

I am getting the following failure on a customer DB upgrading 9.2 to 9.3

Selecting previously unselected package postgresql-9.2.
Unpacking postgresql-9.2 (from
.../postgresql-9.2_9.2.8-1.pgdg12.4+1_amd64.deb) ...
Processing triggers for postgresql-common ...
Setting up postgresql-client-9.2 (9.2.8-1.pgdg12.4+1) ...
Setting up postgresql-9.2 (9.2.8-1.pgdg12.4+1) ...
Creating new cluster 9.2/main ...
config /etc/postgresql/9.2/main
data /var/lib/postgresql/9.2/main
locale C
port 5433
* Starting PostgreSQL 9.2 database server
...done.
* Stopping PostgreSQL 9.2 database server
...done.
* Stopping PostgreSQL 9.3 database server
...done.
Performing Consistency Checks
-----------------------------
Checking cluster versions ok
SQL command failed
CREATE TEMPORARY TABLE info_rels (reloid) AS SELECT c.oid FROM
pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON
c.relnamespace = n.oid LEFT OUTER JOIN pg_catalog.pg_index i ON
c.oid = i.indexrelid WHERE relkind IN ('r', 'm', 'i', 'S') AND
i.indisvalid IS DISTINCT FROM false AND i.indisready IS DISTINCT FROM
false AND ((n.nspname !~ '^pg_temp_' AND n.nspname !~
'^pg_toast_temp_' AND n.nspname NOT IN ('pg_catalog',
'information_schema', 'binary_upgrade', 'pg_toast') AND c.oid >=
16384) OR (n.nspname = 'pg_catalog' AND relname IN
('pg_largeobject', 'pg_largeobject_loid_pn_index',
'pg_largeobject_metadata', 'pg_largeobject_metadata_oid_index') ));
ERROR: operator does not exist: name !~ unknown
LINE 1: ...disready IS DISTINCT FROM false AND ((n.nspname !~ '^pg_te...
^
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts.

----

Why would

"ERROR: operator does not exist: name !~ unknown"

Come up ?

Any way to work around this?