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Fingerprint sudo and su authentication on Thinkpad E430

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https://bbs.archlinux.org – I have followed the tutorial on the Arch Wiki (https://wiki.archlinux.org/index.php/Fingerprint-gui) to enable fingerprint authentication using the fingerprint-gui, changing the files /etc/pam.d/sudo and /etc/pam.d/su as described.su is working fine with fingerprint, however when I try to use sudo, first it prompts for a password, like this:"Password:"Then if you type anything, it asks for the real password:"[sudo] password for eric:"I can't understand why su works fine and sudo does not. My files look like this:/etc/pam.d/su#%PAM-1.0auth        &#1 (HowTos)