GNS3 couldn't run /usr/bin/dumpcap in child process: Permission Denied.

Ubuntu 16.04 LTS GNS3: Problem: couldn’t run /usr/bin/dumpcap in child process: Permission Denied.

Solution:

• Enable non-root user to capture network traffic by reconfiguring wireshark.

gns3a@gns3A:~$ sudo dpkg-reconfigure wireshark-common 

• Add wireshark group to the user that you want to start GNS3 program.

gns3a@gns3A:~$ sudo gpasswd -a $USER wireshark 

• Logout and Login again.