安装pear包debian squees

我尝试安装在我的debian服务器上的php梨包，但我得到了跟随错误输出。

:~# sudo apt-get install php-pear Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: php5-suhosin Use 'apt-get autoremove' to remove them. Suggested packages: php5-dev The following NEW packages will be installed: php-pear 0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded. Need to get 366 kB of archives. After this operation, 2,407 kB of additional disk space will be used. Err http://packages.dotdeb.org/ squeeze/all php-pear all 5.3.21-1~dotdeb.0 404 Not Found Failed to fetch http://packages.dotdeb.org/dists/squeeze/php5/binary-all/php-pear_5.3.21-1~dotdeb.0_all.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? 

提前致谢！

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