安装 ubuntu 后，我尝试启用 livepatch，但首先遇到此错误：
error executing enable: cannot enable machine: bad temporary server status 500 (URL: https://livepatch.canonical.com/api/machine-tokens) server response: machine token already exists
所以我这样做了sudo rm /etc/machine-id /var/lib/dbus/machine-id && sudo systemd-machine-id-setup，sudo rm /etc/machine-id /var/lib/dbus/machine-id && sudo systemd-machine-id-setup但是当我再次尝试启用 livepatch 时，出现了新的错误：
error executing enable: failed to read machine-id