This looks like a fairly straightforward case of looping on lines and
using only the last pass as the result of the whole.

https://git.launchpad.net/ubuntu/+source/pam/tree/modules/pam_env/pam_env.c#n887

What's not so clear is whether we should fail when there's an error
anywhere or simply ignore errors in the env file parsing. Failing auth
on any error seems pretty drastic, but maybe more "correct".

** Tags added: dcr-incoming

** Changed in: pam (Ubuntu)
       Status: New => Triaged

** Changed in: pam (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/2115874

Title:
  error when last pam_environment line is an error

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