I wanted to test Ubuntu Advantage/Pro options on my system:
~$ ▶ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy
~$ ▶ sudo pro status
SERVICE ENTITLED STATUS DESCRIPTION
esm-apps yes enabled Expanded Security Maintenance for Applications
esm-infra yes enabled Expanded Security Maintenance for Infrastructure
livepatch yes enabled Canonical Livepatch service
realtime-kernel yes disabled Ubuntu kernel with PREEMPT_RT patches integrated
Enable services with: pro enable <service>
Account: xyz@zyx.com
Subscription: Ubuntu Pro - free personal subscription
~$ ▶ sudo pro enable realtime-kernel
One moment, checking your subscription first
Real-time kernel cannot be enabled with Livepatch.
Disable Livepatch and proceed to enable Real-time kernel? (y/N)
Cannot enable Real-time kernel when Livepatch is enabled.
It seems that the two option livepatch and realtime-kernel are mutually exclusive.
What is realtime-kernel option anyway? It's not mentioned in the manual: https://manpages.ubuntu.com/manpages/focal/man1/ua.1.html
So how do these two options differ then? Is there an advantage to using either?