VPS换成了Debian9，运行curl的时候提示：

-bash: curl: command not found

运行 sudo apt-get install curl 结果被告知sudo命令也未找到：

-bash: sudo: command not found

运行 apt-get install curl 结果又提示 404 Not Found 的错误：

Reading package lists… Done
Building dependency tree      
Reading state information… Done
The following additional packages will be installed:
   libcurl4
The following NEW packages will be installed:
   curl libcurl4
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 596 kB of archives.
After this operation, 1,123 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://deb.debian.org/debian buster/main amd64 libcurl4 amd64 7.64.0-4
   404  Not Found [IP: 151.101.26.132 80]
Err:2 http://deb.debian.org/debian buster/main amd64 curl amd64 7.64.0-4
   404  Not Found [IP: 151.101.26.132 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/c/curl/libcurl4_7.64.0-4_amd64.deb  404  Not Found [IP: 151.101.26.132 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/c/curl/curl_7.64.0-4_amd64.deb  404  Not Found [IP: 151.101.26.132 80]
E: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing?

运行 apt-get install sudo 依旧是 404 Not Found 的报错：

Reading package lists… Done
Building dependency tree      
Reading state information… Done
The following package was automatically installed and is no longer required:
   grub-pc-bin
Use ‘apt autoremove’ to remove it.
The following NEW packages will be installed:
   sudo
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,055 kB of archives.
After this operation, 3,108 kB of additional disk space will be used.
Err:1 http://deb.debian.org/debian stretch/main amd64 sudo amd64 1.8.19p1-2.1
   404  Not Found [IP: 146.75.94.132 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/s/sudo/sudo_1.8.19p1-2.1_amd64.deb  404  Not Found [IP: 146.75.94.132 80]
E: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing?

ping了一下 deb.debian.org 发现是可以正常解析的，所以应该排除是dns的问题
于是尝试 apt-get update 之后再运行 apt-get install sudo 问题解决（curl同理）

如还不能解决问题的朋友可以尝试 apt update 以及 sudo apt upgrade

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