/usr/lib/x86_64-linux-gnu/kamailio/kamctl/ is in kamailio 4.0.4-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/dbtextdb/
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/dbtextdb/dbtextdb.py
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.base
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.ctlbase
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.dbtext
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.fifo
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.ser
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.ser_mi
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.sqlbase
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamctl.unixsock
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamdbctl.base
/usr/lib/x86_64-linux-gnu/kamailio/kamctl/kamdbctl.dbtext