Enable monitor mode on Linux for Wireshark

Question

I need to enable monitor mode on my Lenovo Legion computer running Ubuntu 22.04.2 LTS to start sniffing wifi traffic through Wireshark. I've correctly installed Wireshark through apt-get install but unfortunately inside the Capture options, under the Monitor mode column, no checkbox is displayed but only a small straight line __

In addition if I run ifconfig -a inside the terminal, no wlan0 interface is shown but only the wlp3s0 interface which seems to be Ethernet (even if it is for sure the wireless interface)

Answer 1

I've figured out how to deal with it:

• Disable automatic reconnection (this would cause the monitor mode to be exited)
• Disconnect the PC from any wifi network
• Run these commands
• sudo ifconfig wlp3s0 down
• sudo iwconfig wlp3s0 mode monitor
• sudo ifconfig wlp3s0 up
• sudo wireshark