Run the following command to disable the Update Ubuntu Pro option in the Software Updater.
sudo pro config set apt_news=false
Disabling apt news turns off a feature that displays news and messages related to security updates, features, services, and Ubuntu Pro subscriptions within the apt command output. This command affects both apt command output in the terminal and the Software Updater application.
While sudo pro config set apt_news=false effectively disables apt news within the terminal, it doesn't completely eliminate all Ubuntu Pro-related notifications. You can get rid of these reminders temporarily until a software upgrade overwrites it by editing the Ubuntu Advantage client configuration file as follows.
sudo nano /etc/ubuntu-advantage/uaclient.conf
Add the following lines to the end of the file, including the proper indentation before apt_news: false:
ua_config:
apt_news: false
If uaclient.conf already has a line in it that says ua_config: then just add a line that says apt_news: false after it instead, including the proper two space characters indentation.
apt_news: false
Save and exit (press Ctrl+O, then Enter, then press Ctrl+X).
Run sudo pro refresh config to enable the change.
sudo pro refresh config