$ journalctl -t canonical-livepatch
[...]
Jun 17 23:11:24 callisto canonical-livepatch[1183]: Client.Check
Jun 17 23:11:24 callisto canonical-livepatch[1183]: Checking with livepatch service.
Jun 17 23:11:24 callisto canonical-livepatch[1183]: updating last-check
Jun 17 23:11:24 callisto canonical-livepatch[1183]: touched last check
Jun 17 23:11:24 callisto canonical-livepatch[1183]: Applying update 52.3 for 4.15.0-51.55-generic
Jun 17 23:11:24 callisto canonical-livepatch[1183]: during refresh: cannot apply patches: cannot apply update: cannot execute finitModule syscall: required key not available
Jun 18 00:11:24 callisto canonical-livepatch[1183]: Client.Check
Jun 18 00:11:24 callisto canonical-livepatch[1183]: Checking with livepatch service.
Jun 18 00:11:24 callisto canonical-livepatch[1183]: updating last-check
Jun 18 00:11:24 callisto canonical-livepatch[1183]: touched last check
Jun 18 00:11:24 callisto canonical-livepatch[1183]: No updates available at this time.
Jun 18 00:11:24 callisto canonical-livepatch[1183]: Module may have caused kernel crash! Not inserting module.
Jun 18 00:11:24 callisto canonical-livepatch[1183]: To override this warning, remove /var/snap/canonical-livepatch/common/locks/livepatch_Ubuntu_4_15_0_51_55_generic_52_52.3
Jun 18 00:11:24 callisto canonical-livepatch[1183]: during refresh: cannot apply patches: lock file "/var/snap/canonical-livepatch/common/locks/livepatch_Ubuntu_4_15_0_51_55_generic_52_52.3" already exists