尝试以下命令：
<pre>
sudo apt-get clean
sudo apt-get update
sudo apt-get install --reinstall vsftpd
If this did not work, purge vsftpd (remove it including its configuration files) and reinstall it:(删除配置文件然后重装)
sudo apt-get purge vsftpd
sudo apt-get install vsftpd
</pre>
