The "SIOCADDRT: File exists" error in Ubuntu typically occurs when you try to add a route to the system routing table and the route already exists.
This error message indicates that the route you are trying to add is already present in the system routing table and cannot be added again.
To resolve the "SIOCADDRT: File exists" error in Ubuntu, you can try the following solutions:
Check the routing table: Use the route command to view the system routing table and check if the route you are trying to add already exists. If the route already exists, you can skip it or remove it before adding it again.
Use the -n option: When adding a route, you can use the -n option to disable name resolution and avoid the "SIOCADDRT: File exists" error.
Use the ip command: Instead of the route command, you can use the ip command to add routes to the system routing table. The ip command allows you to specify a specific routing table, which can help avoid the "SIOCADDRT: File exists" error.
Check for typos: Make sure that you have entered the correct route and that there are no typos or mistakes in the command.
Check the permissions: Make sure that you have the necessary permissions to add routes to the system routing table. You may need to use the sudo command to run the route or ip command as the root user.
Keep in mind that these are just a few examples of how to resolve the "SIOCADDRT: File exists" error in Ubuntu. You can customize the solutions to meet the specific requirements of your system. You should also regularly review and update the routing table to ensure that it is correct and efficient.