一、首先使用自带的vi编辑器
安装完ubuntu后没有默认的root密码，如果要设置root密码需要进行如下步骤：
1 sudo passwd
2 连续输入两次新密码
二、vi编辑器下使用【backspace】无法删除
1.
先找到vimrc.tiny文件，一般路径是
cd /etc/vim/
2.
由于vimrc.tiny文件需要用到root权限修改，所以要使用
sudo gedit vimrc.tiny
命令，在gedit里修改
3.
把原来的
set compatible
替换成
set nocompatible
set backspace=indent,eol,start
如下图所示
然后就可以进行丝滑的删除操作啦~
三、开始进行替换源操作，参考链接为：https://blog.csdn.net/wzyaiwl/article/details/88571414
Ubuntu16.04默认是国外的源，这非常容易造成我们下载速度的缓慢。接下来，我们将其更换成国内阿里的源。
- 复制本地源到另一个文件
- 更换源
- 更新源
- shell脚本
复制本地源到另一个文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.old
更换源
用vi打开sources.list文件，将里面的内容换成下面。
deb http://mirrors.aliyun.com/ubuntu/ xenial main deb-src http://mirrors.aliyun.com/ubuntu/ xenial main deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main deb http://mirrors.aliyun.com/ubuntu/ xenial universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb http://mirrors.aliyun.com/ubuntu/ xenial-security main deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe
更新源
更新软件包列表
sudo apt-get update
休复损坏的软件包，尝试卸载出错的包，重新安装正确版本的。
sudo apt-get -f install
升级系统中的所有软件包
sudo apt-get upgrade
脚本
在当前家目录下，将要使用的源保存在sources.list文件中。
# 更换国内源（使用的是阿里的源） #sourcesfile=/etc/apt/sources.list.old #if [ ! -e "$sourcesfile" ]; then # echo 'backups sources.list' # sudo cp /etc/apt/sources.list /etc/apt/sources.list.old # sudo cp $HOME/sources.list /etc/apt/sources.list #fi # 软件更新 sudo apt -y update # 更新源 sudo dpkg --configure -a sudo apt -y upgrade # 更新已安装的包 sudo apt -y dist-upgrade # 升级系统 # 注意以上安装过程中出现的安装选项，直接回车或者选择yes即可 sudo apt-get -y autoremove sudo apt -y autoclean
其他源
西电源（只有校内网网线使用，但是不限制流量，还是十分靠谱的）
deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial main restricted universe multiverse #deb-src http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial main restricted universe multiverse deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-security main restricted universe multiverse #deb-src http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-security main restricted universe multiverse deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-updates main restricted universe multiverse #deb-src http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-updates main restricted universe multiverse #deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-backports main restricted universe multiverse #deb-src http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-backports main restricted universe multiverse #deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-proposed main restricted universe multiverse #deb-src http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-proposed main restricted universe multiverse
清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
网易源
deb http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse
参考于https://blog.csdn.net/qq_35451572/article/details/79516563