在联想 T500 笔记本电脑上，我从 20.04 升级到 22.04。升级后启动时，它会进入“紧急模式”。
然后，我从 Live USB 上的不同分区安装了 Ubuntu 22.04，并且成功启动，因此这似乎意味着没有硬件兼容性问题。我已经成功地将其他几个系统（所有 x140e）从 20.04 升级到 22.04。
sysjournal -xb 命令的输出没有显示任何明显的错误。日志的最后几行是：
░░ Subject: A start job for unit NetworkManager-dispatcher.service has finished successfully
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ A start job for unit NetworkManager-dispatcher.service has finished successfully.
░░
░░ The job identifier is 239497.
Jul 18 04:51:39 earl dbus-daemon[741]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 18 04:51:39 earl systemd[1]: Starting Network Manager Script Dispatcher Service...
░░ Subject: A start job for unit NetworkManager-dispatcher.service has begun execution
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ A start job for unit NetworkManager-dispatcher.service has begun execution.
░░
░░ The job identifier is 239497.
Jul 18 04:51:39 ea
这与成功启动的全新安装日志中的内容类似。我应该查找什么来了解升级版本为何启动到紧急模式？
还有其他提示可以查找升级后为何进入紧急模式吗？