当我尝试升级时，收到以下消息：
W:The repository
'http://archive.canonical.com/ubuntu vivid Release' does not have a Release file.,
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
E:Failed to fetch http://archive.canonical.com/ubuntu/dists/vivid/partner/source/Sources 404 Not Found [IP: 91.189.92.150 80],
E:Some index files failed to download. They have been ignored, or old ones used instead.