获取不到软件

现象

Err:1 http://security.ubuntu.com/ubuntu bionic-security/main amd64 openssh-sftp-server amd64 1:7.6p1-4ubuntu0.2
404 Not Found [IP: 91.189.88.149 80]
Err:2 http://security.ubuntu.com/ubuntu bionic-security/main amd64 openssh-server amd64 1:7.6p1-4ubuntu0.2
404 Not Found [IP: 91.189.88.149 80]
Err:3 http://security.ubuntu.com/ubuntu bionic-security/main amd64 ssh all 1:7.6p1-4ubuntu0.2
404 Not Found [IP: 91.189.88.149 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-sftp-server_7.6p1-4ubuntu0.2_amd64.deb 404 Not Found [IP: 91.189.88.149 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_7.6p1-4ubuntu0.2_amd64.deb 404 Not Found [IP: 91.189.88.149 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh_7.6p1-4ubuntu0.2_all.deb 404 Not Found [IP: 91.189.88.149 80]
E: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing?

方案

sudo apt-get update

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