从这里获取令牌并尝试启用 livepatch 后：
sudo canonical-livepatch enable XXXXXXXXXXXXXXXXXX
我收到以下错误消息：
2020/08/31 17:19:57 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
我该如何解决这个问题并启用 Canonical livepatch？
Ubuntu 详细信息：
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.1 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal