Attached is a snapshot of what's displayed when I enter "Christian Périer" as user's full name in user-setup (I used full name rather than login name so that I can see what happens later when the user is created and whether the right encoding is used in what's passed ao useradd)). Please note that "<E9>" is the code for "é" in ISO-8859-1. So it barely seems that the keyboard input is interpreted as encoded in ISO and not UTF-8. If I alter run "debconf-get user-fullname" in VT2, I get "Christian Périer" properly displayed (aka exactly what I entered) --
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broken-input.png
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signature.asc
Description: Digital signature