BUG #14892: Regex Errors on Install

The following bug has been logged on the website:

Bug reference: 14892
Logged by: Robert Simmons
Email address: rsimmons0(at)gmail(dot)com
PostgreSQL version: 10.0
Operating system: Ubuntu Server 17.10
Description:

I got the following regex errors during the package install process using
the official PPA:

Setting up postgresql-10 (10.0-1.pgdg17.04+1) ...
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE
in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at /usr/sbin/pam_getenv line 78.
Creating new PostgreSQL cluster 10/main ...