How to resolve failed network card startup in Linux.

If the network card fails to start when Linux boots up, you can try the following methods to troubleshoot the issue:

1. Check if the network card is plugged in properly: First, make sure the network card is correctly inserted and the connection is good.
2. Check if the network card driver is loaded: you can use the command lsmod | grep to see if the correct network card driver is loaded.
3. Check network settings: Verify that network settings are correct, such as IP address, subnet mask, and gateway. You can use commands like ifconfig and route -n to view and configure network parameters.
4. Restarting network services: You can try restarting the network services by using the command service network restart or systemctl restart network.
5. Check the network connection: You can test the network connection using the ping command, such as ping www.google.com.
6. Check the firewall settings: Sometimes firewall settings can affect network connection, you can try disabling the firewall or modifying the firewall settings.

If none of the above methods solve the issue, it could be due to hardware failure of the network card or incompatible drivers. You can try updating the network card drivers or replacing the network card.