我的笔记本电脑最初配置了 18.10 版加密硬盘。升级到 19.04 版后，我在启动过程中发现以下错误：
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
Volume group "ubuntu-vg" not found
Cannot process volume group ubuntu.vg
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
Gave up waiting for suspend/resume device
/dev/mapper/ubuntu--vg-root: clean, 789506/120987648 files etc etc.
然后我随后启动成功。