Canonical Livepatch Client
Canonical Livepatch patches high and critical linux kernel vulnerabilities removing the immediate need to reboot to upgrade the kernel, instead allowing the downtime to be scheduled. It is a part of the Ubuntu Pro offering.
The Canonical Livepatch Client is an application that runs on your machine and periodically checks for patches.
See our docs at https://ubuntu.com/security/livepatch/docs/livepatch