/usr/bin/lchfn
/usr/bin/lchsh
/usr/sbin/lchage
/usr/sbin/lgroupadd
/usr/sbin/lgroupdel
/usr/sbin/lgroupmod
/usr/sbin/libuser-lid
/usr/sbin/lnewusers
/usr/sbin/lpasswd
/usr/sbin/luseradd
/usr/sbin/luserdel
/usr/sbin/lusermod
You may install this package on Debian with
apt-get
install libuser