我在Ubuntu 16.04服务器上运行“ sudo apt -y更新”，但出现以下错误：
# apt -y update
Reading package lists... Done
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
root@yuyue-HP-Pro-3380-MT:/var/lib/apt# apt -y update
Get:1 http://cn.archive.ubuntu.com/ubuntu xenial InRelease [132 B]
Err:1 http://cn.archive.ubuntu.com/ubuntu xenial InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Get:2 http://cn.archive.ubuntu.com/ubuntu xenial-updates InRelease [132 B]
Err:2 http://cn.archive.ubuntu.com/ubuntu xenial-updates InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Get:3 http://cn.archive.ubuntu.com/ubuntu xenial-backports InRelease [132 B]
Err:3 http://cn.archive.ubuntu.com/ubuntu xenial-backports InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Ign:4 http://us.archive.ubuntu.com/ubuntu saucy InRelease
Hit:5 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:6 http://us.archive.ubuntu.com/ubuntu saucy-updates InRelease
Err:7 http://us.archive.ubuntu.com/ubuntu saucy Release
404 Not Found [IP: 2001:67c:1562::16 80]
Err:8 http://us.archive.ubuntu.com/ubuntu saucy-updates Release
404 Not Found [IP: 2001:67c:1562::16 80]
Reading package lists... Done
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu saucy-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
原因可能是什么？我该如何解决这个问题？谢谢！
感谢AskUbuntu中的@Videonauth。我借助his answer解决了这个问题。这是我使用的命令：
sudo -i
cat > /etc/apt/sources.list << EOF
deb http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
#deb http://archive.ubuntu.com/ubuntu xenial-proposed restricted main universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu xenial-proposed restricted main universe multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
EOF
sudo apt clean
sudo apt update
sudo apt dist-upgrade
对于可能仍然会遇到相同问题的任何人，以上解决方案对我而言都不起作用。在我的情况下，根目录分区已满（已用完100％），我使用的是
df -h
cd /
du -sch * --exclude=home
检查什么用完了磁盘空间。就我而言，在根目录中有一个mysql数据文件夹的备份，占了9.1GB空间的约3.7GB。我所做的就是删除mysql文件夹。但是请注意删除的内容。