Thanks for reporting back so fast. I live in the Netherlands, so we
might have a bit of a time difference.

Reviewed edits have been made already in the following pages:

http://askubuntu.com/questions/159727/how-can-i-use-a-passcode-generator-for-authentication-for-remote-logins
http://askubuntu.com/questions/193248/google-authenticator-for-desktop-lightdm-or-gdm-plugin

But I do agree to your view that modifying PAM configurations
automatically and without user interaction is extremely dangerous
because it goes against user expectations and might indeed make matters
worse.

The package itself does not install any configuration in any pam.d
modules like sshd or lightdm/gdm and I do not intend to change that
either for the same reasons.

Removing google-authenticator from the ubuntu and/or debian repository
also effectively changes the security configuration.

So there are a few options left: 
* warning users interactively at an update when they have google-authenticator 
installed
* ring some bells at security authorities and tech media to alert people about 
this
* Think, think, think. Hope you can help me with this.

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https://bugs.launchpad.net/bugs/1491597

Title:
  brute force attack on password possible on many existing google-
  authenticator setups

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