Vitux published a tutorial about installing and using Wireshark on Ubuntu 20.04 LTS.
How to Install and Use Wireshark on Ubuntu 20.04 LTS
Wireshark is an open-source network protocol analyzer tool indispensable for system administration and security. It drills down and displays data travelling on the network. Wireshark allows you to either capture live network packets or to save it for offline analysis.
How to Install and Use Wireshark on Ubuntu 20.04 LTS