I've installed Wireshark in Ubuntu 16.04 with the command:
sudo apt-get install wireshark
After program start, Start Capture and Stop Capture buttons are disabled. Even opening Capture Options window, I can't see any interfaces to capture packets from. They don't show even with menu
Capture > Refresh Interfaces.
Where are all machine's interfaces?
I also noticed there's a message in the main screen:
Couldn't run /usr/bin/dumpcap in child process: Permission denied