Linux Mint终端输入命令apt i，按Tab键无法自动补全install，这很不方便。

修改bash

在终端输入命令sudo vi /etc/bash.bashrc，编辑enable bash completion in interactive shells这一项配置，将其注释全部去掉。

找到下面这几行：

#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

去掉前面的#号：

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

重启

source /etc/bash_completion