/etc/pam.d/polkit-1 is in policykit-1 0.104-1ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #%PAM-1.0
@include common-auth
@include common-account
@include common-password
session required pam_env.so readenv=1 user_readenv=0
session required pam_env.so readenv=1 envfile=/etc/default/locale user_readenv=0
@include common-session
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