我是 Kubuntu 或 Ubuntu 的新手。我将 Kubuntu 20.04 升级到 20.10，但无法启动我的 PC。在启动过程中，我收到此错误消息：
Failed to start default target: Transaction for graphical.target/start is destructive (emergency.target has 'start' job queued, but 'stop' is included in transaction).