我有 canonical-livepatch 运行，但它显示下面的错误消息。首先它尝试更新错误cannot apply patches: cannot apply update: cannot execute finitModule syscall: required key not available。在那次失败之后，它拒绝再次尝试另一个更新。
应用更新时可能出现什么问题？我找不到有关该错误消息的任何信息。
我正在运行 Ubuntu 18.04.2 LTS。
$ 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 …