How to resolve the issue of not being able to obtain an IP address via DHCP in Ubuntu?

If Ubuntu is unable to obtain a DHCP address, you can try the following troubleshooting steps:

1. Check network connection: Ensure the network connection is working properly, make sure the Ethernet cable is plugged in securely, and confirm that the Wi-Fi is connected.
2. Restarting the network service: One possible solution to resolve the problem is by restarting the network service through a command. The following command can be used to restart the network service:

sudo systemctl restart networking

1. Check the DHCP settings: Make sure the DHCP service is running properly. You can use the following command to check the status of the DHCP service:

sudo systemctl status dhclient

1. Manually assigning IP addresses: If DHCP is not functioning properly, you can try manually assigning IP addresses. You can manually configure IP addresses using the following commands:

sudo ifconfig [interface] [IP address] netmask [subnet mask]

1. Check the firewall settings: Sometimes firewalls may cause DHCP to not work properly. You can try temporarily disabling the firewall to see if you can obtain a DHCP address.

sudo ufw disable

If the above methods do not solve the problem, it is recommended to try restarting the system or reinstalling the network drivers.