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When I try any other finger with:

%> fprintd-enroll left-index-finger
Using device /net/reactivated/Fprint/Device/0
failed to claim device: Not Authorized: net.reactivated.fprint.device.setusername

It doesn't work for me;

But if I don't specify finger (which uses right-index by default):

%> fprintd-enroll 
Using device /net/reactivated/Fprint/Device/0
Enrolling right index finger.

It works

Running on Arch Linux , and packages installed from aur:

fprintd 0.4.1-4
libfprint 0.4.0-3


%> fprintd-enroll -f left-index-finger
Using device /net/reactivated/Fprint/Device/0
Enrolling right index finger.
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up vote 3 down vote accepted

I think this is only supported as of fprintd 0.5.1: http://cgit.freedesktop.org/libfprint/fprintd/commit/?id=7eb1f0fd86a4168cc74c63b549086682bfb00b3e

When I build fprintd 0.5.1, the -f option does work correctly.

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Yes, 0.5.1 works! – warl0ck Sep 3 '13 at 15:56

From the fprintd man page:

fprintd-enroll [username]
-f finger
For fprintd-enroll, the finger to enroll

It looks like you are placing "left-index-finger" as the username. and the user left-index-finger is Not Authorized

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