ubuntu安装不了软件

问题：
default@default:~$ sudo apt-get install openssh-server
Reading package lists... Error!
E: Malformed Description-md5 line; doesn't have the required length (32 != 117) 'cbee657abf0923de6T���L���3�#k�@Y~'�[eD`��IP���C
��0��|��&���b%J�$�A���v��� �
Ӡ�)E��g����'
E: Unable to parse package file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_raring_main_binary-i386_Packages (1)
E: Problem opening /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_raring_universe_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

解决方法：
sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean

sudo apt-get update

http://ubuntuforums.org/showthread.php?t=2190797&p=12860782#post12860782

http://ubuntuforums.org/showthread.php?t=2198322