There are some Files, fiddler needs write privileges: rm: cannot remove '/opt/fiddler/listeningProcess.txt': Permission denied rm: cannot remove '/opt/fiddler/gsettings.txt': Permission denied rm: cannot remove '/opt/fiddler/proxiesFromInterfaces.txt': Permission denied ... If this file is stored with the exe file, it is not possible to install fiddler in /bin or /opt and run without root privileges. I think it would be good to locate that file in the users home folder or in /tmp.