E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages
……………………
在网上搜到了解决办法，现在记录下来，以便今后查阅：
终端中输入以下两条命令：
sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update