http://www.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion/wiki/SUID_Disabler_and_Permission_Hardener
For security hardening, in Kicksecure, passwd is non-SUID. For the rationale behind this, see this wiki page from the top. Therefore, passwd must be run as root / with sudo . sudo passwd user See configuring passwords for detailed information on changing user account passwords.