环境：
桥接网络下的centos7，安装docker，docker容器内为ubuntu 22.04.1版本
起因：
嫌宿主机中修改文件麻烦，想去docker容器中修改，发现vim命令没有，进而apt update
发现apt update失败
换网易源 —>> 报错404
换阿里源 —>> NO_PUBKEY没有密钥
gpg --keyserver keyserver.ubuntu.com 命令拉取密钥
gpg :command not found
也就是说换了一圈回来还是得更新apt，因为docker容器提供给我们的都是简化的容器，很多工具没有
没办法只有尝试，物理机挂代理，换官方源，虚拟机nat
更新官方源依旧失败，提示连接失败，不知道是DNS的问题还是其他问题，这里ping google是不通的，但是github可以通
无解。。。。。
然后搜了几个ubuntu22.04版本的源，更新，成功
阿里源：
#deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted
# See http://mirrors.aliyun.com/ubuntu/ for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted
# deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://mirrors.aliyun.com/ubuntu/ focal universe
# deb-src http://mirrors.aliyun.com/ubuntu/ focal universe
deb http://mirrors.aliyun.com/ubuntu/ focal-updates universe
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://mirrors.aliyun.com/ubuntu/ focal multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://mirrors.aliyun.com/ubuntu/ focal partner
# deb-src http://mirrors.aliyun.com/ubuntu/ focal partner
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
deb http://mirrors.aliyun.com/ubuntu/ focal-security universe
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-security universe
deb http://mirrors.aliyun.com/ubuntu/ focal-security multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-security multiverse
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
