when I use a new host.

配置源

1. apt源

   deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
   deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse 
   deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 
   deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse 
   deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse 
   deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse 
   deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse 
   deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 
   deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse 
   deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
   

   但是我发现，Ubuntu18.04下粘贴上文，会导致安装软件失败，提示unmet缺少依赖，即使-f也不行。
   apt源备份 /ect/apt/sources.list
   嵌入式apt源:
   https://mirrors.ustc.edu.cn/ubuntu-ports/
   termux源:
   deb https://mirrors.ustc.edu.cn/termux stable main
   :%s/xxxx/mirrors.uest.edu.cn/g
   vim命令
   %s/htt.*.*com/http:\/\/mirrors.ustc.edu.cn/g
   看了20分钟sed文档后

   sudo bash -c "cp /etc/apt/sources.list /etc/apt/sources.list-bak && sed -e s/'htt.*.*com'/'http:\/\/mirrors.ustc.edu.cn'/g /etc/apt/sources.list-bak > /etc/apt/sources.list"
   

   sudo bash -c "cp /etc/apt/sources.list /etc/apt/sources.list-bak && sed -e s/'htt.*.*com'/'http:\/\/mirrors.ustc.edu.cn'/g /etc/apt/sources.list-bak > /etc/apt/sources.list";
   echo "
   sudo apt-get update;
   sudo apt-get install python-pip -y;
   sudo apt-get install axel -y;
   sudo pip install speedtest-cli;
   sudo apt-get install htop;
   sudo apt-get install python3-pip -y;
   # sudo apt-get install openjdk-7-jdk -y;
   sudo apt install openjdk-8-jdk-headless -y;
   sudo snap install --classic code; # https://code.visualstudio.com/docs/setup/linux
   sudo apt-get install tinyproxy -y;
   #看图神器
   sudo apt-get install caca-utils -y; 
   sudo apt-get install lrzsz -y;
   sudo apt-get install nmap -y;
   sudo apt-get install whois -y;
   sudo apt-get install iftop -y;
   sudo apt-get install reptyr -y;
   
   # wps https://www.wps.cn/product/wpslinux
   # mysql: apt install mysql-server-8.0
   sudo apt install git -y;
   " > to_install
   &&
   chmod 777 to_install
   &&
   bash to_install
   

2. Maven源：

   <mirrors>
       <mirror>
         <id>alimavenid>
         <name>aliyun mavenname>
     　　<url>http://maven.aliyun.com/nexus/content/groups/public/url>
         <mirrorOf>centralmirrorOf>        
       mirror>
   mirrors>
   

3. pip源
   修改 ~/.config/pip/pip.conf 这个是过时的！ $HOME/.pip/pip.conf (Linux), %APPDATA%\pip\pip.ini (Windows 10)
   为
   [global]
   index-url = https://pypi.tuna.tsinghua.edu.cn/simple
   pip源备份 备份？ 备什么份，把自定义的删了即可
   采用清华pip源官网的写法：
   临时使用pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package
   长期使用

    pip install pip -U pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
   

   原来的源差到连pip都无法更新？？？
   pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U

4. Docker
   中科大 sudo vim /etc/docker/daemon.json

  {
   "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
  } 

sudo systemctl restart docker然后敲入docker info看最下面Registry Mirrors来确定修改成功。

OS config

1. 更新man手册

  apt-get install manpages-de  manpages-de-dev  manpages-dev glibc-doc manpages-posix-dev  manpages-posix

2. Unix性能测试

   wget --no-check-certificate https://github.com/teddysun/across/raw/master/unixbench.sh
   

3. 系统是否支持无线网卡（不需要其他驱动）

   https://help.ubuntu.com/stable/ubuntu-help/net-wireless-troubleshooting-hardware-check.html
   https://help.ubuntu.com/community/WifiDocs/WirelessCardsSupported
   如果不支持，就是看不见无线网络，用手机USB线做有线热点，幸运的话，那里面的‘附加驱动’里就有你的无线网卡驱动。
   Ubuntu apt不能安装E:无法修正错误,因为您要求某些软件包保持现状,就是它们破坏了软件包间的依赖关系 出现原因：1.软件安装过程中强制中断，而后改变了安装源 2.软件和更新中的源和apt-get中的源相互独立？ 解决办法：恢复原本的源，在“软件更新”中勾选所有的选项，静待更新完成，最好不要中途中止。

4. 锁定内核更新 https://connectwww.com/how-to-prevent-ubuntu-kernel-update-disable-or-stop-linux-kernel-update
   sudo apt-mark hold uname -r or
   sudo nano /etc/apt/apt.conf.d/50unattended-upgrades or
   echo package-name hold" | sudo dpkg --set-selections

5. 禁止一些服务，systemctl disable是不足够的 systemctl list-units --type service --state running to show and using arg disable disable not persistent, use mask/unmask how-to-stop-snapd-from-auto-updating

systemctl mask tinyproxy.service;
systemctl mask docker;
systemctl mask snapd.service;

Software config

1. snap bin目录配置
   echo "export PATH=$PATH:/snap/bin" >> ~/.bashrc
source ~/.bashrc
   snap 阻止自动更新 snap refresh --hold
2. 装机必备：
   indicator-sysmonitor
   搜狗拼音输入法，按照搜狗的指引操作即可：https://shurufa.sogou.com/linux/guide
3. FireFox 字体放大：layout.css.devPixelsPerPx