sudo apt-get 'NOSPLIT Error'

The domain that you are trying to connect to, http://na.archive.ubuntu.com, has expired. Choose a new download server in Software & Updates.

1. Search for Software & Updates in the Dash and open it.

2. In the Software & Updates window select Ubuntu Software tab -> after Download from: click the black triangle to show the dropdown menu -> from the dropdown menu click Other.

3. A new Choose a Download Server window will open, and in this window click the Select Best Server button.

4. Wait for Select Best Server to finish and click the Choose Server button. The best server that is selected will probably be a server in or near the country where you are located.

5. In the Authenticate window, authenticate with your user password.

6. You will see a window with a message that says The information about available software is out-of-date. Click the Reload button to update the available software cache.