完成标准更新升级后，我收到 2 条以橙色突出显示的警告消息：
dpkg: warning: unable to delete the old directory '/var/lib/ubuntu-advantage': Directory not empty
dpkg: warning: unable to delete the old directory '/etc/ubuntu-advantage': Directory not empty
有人知道这是什么东西吗我应该保留它还是需要删除一些东西？