C++ g++；windows上ubuntu上的bash安装

当我试图在windows上的ubuntu上的bash上安装g++时，我遇到了一个错误

`

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`您的apt缓存可能已过时。首先尝试运行apt get update。你试图安装的版本已经不在RePOS中了。

这个问题是C++在这里不是主题。

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_4.4.0-96.119_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/glibc/libc6-dev_2.23-0ubuntu9_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++-5-dev_5.4.0-6ubuntu1~16.04.4_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/g++-5_5.4.0-6ubuntu1~16.04.4_amd64.deb  404  Not Found [IP: 91.189.88.152 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_4.4.0-96.119_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/glibc/libc6-dev_2.23-0ubuntu9_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++-5-dev_5.4.0-6ubuntu1~16.04.4_amd64.deb  404  Not Found [IP: 91.189.88.152 80]

 E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/g++-5_5.4.0-6ubuntu1~16.04.4_amd64.deb  404  Not Found [IP: 91.189.88.152 80]