Err:1 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 linux-libc-dev amd64 4.15.0-29.31
404 Not Found [IP: 91.189.88.162 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_4.15.0-29.31_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
更改ubuntu apt-get的源
vim /etc/apt/sources.list
修改最下面将http://security.ubuntu.com/ubuntu/改为http://mirrors.163.com/ubuntu/
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security main restricted
deb http://mirrors.163.com/ubuntu/ bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security universe
deb http://mirrors.163.com/ubuntu/ bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security multiverse
#deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security main restricted
#deb http://security.ubuntu.com/ubuntu/ bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security universe
#deb http://security.ubuntu.com/ubuntu/ bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security multiverse
参考https://www.cnblogs.com/TechSnail/p/7754969.html
有可能需要修改/etc/hosts