E: Some index files failed to download. They have been ignored, or old ones used instead.

ubuntu apt-get update  
1.    ：E:Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
                       ，         。          ，             ，        。

    ：  /var/lib/apt/lists         
      
sudo rm /var/cache/apt/archives/lock

sudo rm /var/lib/dpkg/lock

         ，