Hello, Thanks for your cooperation. Tested on Xenial
1. create xenial instance 2. add proposed repository 3. apt install libpam-runtime 4. apt install postgresql warnings are gone. Thanks! dpkg -l | grep pam ii libpam-modules:amd64 1.1.8-3.2ubuntu2 amd64 Pluggable Authentication Modules for PAM ii libpam-modules-bin 1.1.8-3.2ubuntu2 amd64 Pluggable Authentication Modules for PAM - helper binaries ii libpam-runtime 1.1.8-3.2ubuntu2.1 all Runtime support for the PAM library ii libpam-systemd:amd64 229-4ubuntu21.1 amd64 system and service manager - PAM module ii libpam0g:amd64 1.1.8-3.2ubuntu2 amd64 Pluggable Authentication Modules library ** Tags removed: verification-needed-xenial ** Tags added: verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1538284 Title: [SRU] Unescaped left brace in regex is deprecated To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1538284/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs