Ubuntu/Debian PGDP

In a fresh new install of PostgreSQL 9.5.2 on Ubuntu 16.04 I am getting this:

...
Setting up postgresql-9.5 (9.5.2-1.pgdg16.04+1) ...
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Creating new cluster 9.5/main ...

It looks like the installation scripts "fixed" or "worked around" this.
I don't think I am the first one to get it, though.

--
Vincenzo Romano - NotOrAnd.IT
Information Technologies
--
NON QVIETIS MARIBVS NAVTA PERITVS