why my wifi logo have an Exclamation mark on ubuntu

Checking the Network Connection

To diagnose the issue with the WiFi connection on Ubuntu, you can start by checking the network connection status using the following command:

nmcli general status

Viewing Network Manager Logs

To further investigate the issue, you can view the Network Manager logs by using the following command:

journalctl -u NetworkManager

Checking WiFi Interface

You can also check the status of the WiFi interface using the following command:

iwconfig

Verifying Network Configuration

To verify the network configuration, you can use the following command to display the network interfaces and their configurations:

ip addr show

Restarting Network Manager Service

If the issue persists, you can try restarting the Network Manager service using the following command:

sudo systemctl restart NetworkManager

Verifying Network Manager Service Status

To ensure that the Network Manager service is running, you can use the following command:

systemctl status NetworkManager