Ubuntu系统Tab键不能自动补全问题解决

1、利用vi编辑器打开/etc/bash.bashrc文件（需要root权限）

 sudo vi /etc/bash.bashrc

 接下来会提示输入密码

2、找到文件中的下列代码

 #enable bash completion in interactive shells
 #if ! shopt -oq posix; then
 #      if [-f  /usr/share/bash-completion/bash_completion ]; then
 #          . /usr/share/bash-completion/bash_completion
 #      elif [ -f /etc/bash_completion]; then
 #           . /etc/bash_completion
 #      fi
 #fi

 将注释符号#去掉，即改成

 #enable bash completion in interactive shells
 if ! shopt -oq posix; then
      if [-f  /usr/share/bash-completion/bash_completion ]; then
           . /usr/share/bash-completion/bash_completion
       elif [ -f /etc/bash_completion]; then
            . /etc/bash_completion
       fi
 fi

 3、最后 source一下 /etc/bash.bashrc即可， 即

 sudo source /etc/bash.bashrc