getting this error while installing in Ubuntu 14.04

Problem running post-install step. Installation may not complete correctly
Error running /home/admin4/ArduinoCreateAgent-1.1/certmanager.sh /home/admin4/ArduinoCreateAgent-1.1/ca.cert.pem: E: There are problems and -y was used without --force-yes
/home/admin4/ArduinoCreateAgent-1.1/certmanager.sh: line 53: certutil: command not found