Here's an strace. HTH.
root:~# printf "%s\0%s\0%s\0" bob s3cr3t Y2009 | strace checkpassword true 3<&0
execve("/bin/checkpassword", ["checkpassword", "true"], [/* 21 vars */]) = 0
open("/dev/urandom", O_RDONLY) = 4
read(4, "\256\17\273\37\16\272d\267"..., 8) = 8
close(4)
*** This bug is a duplicate of bug 372025 ***
https://bugs.launchpad.net/bugs/372025
** This bug has been marked a duplicate of bug 372025
checkpassword apparently broken in Jaunty
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fgetty doesn't work in ubuntu
https://bugs.launchpad.net/bugs/411050
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