我刚刚将我的 Ubuntu 从 16.04 升级到 18.04，并收到以下消息：
The upgrade has completed but there were errors during the upgrade process.
To continue please press [ENTER]
没有关于错误的更多信息。按下 ENTER 后，我执行了以下操作：
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo apt do-release-upgrade
并且没有错误，我收到消息：
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
我很担心这个“升级过程中出现错误”的消息，因为我读到升级后，重新启动后可能会出现问题 - 桌面可能不会显示。我如何检查升级过程中发生了哪些错误以及如何修复它们？