Firstly open terminal and update ubuntu linux repositories-
sudo apt-get update
Install Wireshark using command-
sudo apt-get install wireshark
Now wireshark has been installed successfully but you can only open it using command-
sudo wiresharkTo run it without root and using wireshark icon configure yes to run without root add your user to wireshark group-
sudo dpkg-reconfigure wireshark-common && sudo usermod -a -G wireshark $USER