getty does this, so reassigning to util-linux. It appears to be
intentional, as it's documented in the man page:
getty has several non-standard features that are useful for
hard-wired and for dial-in lines:
o Adapts the tty settings to parity bits and to erase,
kill, end-of-line and uppercase characters when it reads
a login name. The program can handle 7-bit characters
with even, odd, none or space parity, and 8-bit charac-
ters with no parity. The following special characters
are recognized: @ and Control-U (kill); #, DEL and back
space (erase); carriage return and line feed (end of
line).
** Changed in: pam (Ubuntu)
Sourcepackagename: pam => util-linux
Status: Unconfirmed => Confirmed
--
password prompt doesn't accept @ symbol
https://launchpad.net/bugs/68988
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