ubuntu 16.04.02 xenial-security 和 xenial launchpad 以及 xenial archive release 没有发布文件

ubuntu 16.04.02 xenial-security 和 xenial launchpad 以及 xenial archive release 没有发布文件
>W: The repository 'http://security.ubuntu.com/ubuntu xenial-security Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

>W: The repository 'http:ppa.launchpad.net/mc3man/xerus-media/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

>W: The repository 'http:us.archive.ubuntu.com/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

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