Ubuntu14.04系統Tab鍵不能自動補全問題解決

1、利用vi編輯器打開/etc/bash.bashrc文件（需要root權限）
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sudo vi /etc/bash.bashrc  

接下來會提示輸入密碼

2、找到文件中的下列代碼
Shell代碼

#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  

將註釋符號#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、最後 source一下 /etc/bash.bashrc即可， 即
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sudo source /etc/bash.bashrc  

轉載至http://logicluo.iteye.com/blog/2145084，希望大家去博主那裏去。