Debian:upgrade时提示不能overwrite '/usr/sbin/add-shell'

来源：由Sarge升级到Lenny时遇到的问题 运行apt-get upgrade 和 apt-get dist-upgrade 时遇到下面的错误： dpkg: error processing /var/cache/apt/archives/debianutils_2.22.1_i386.deb (--unpack): trying to overwrite '/usr/sbin/add-shell'， which is also in package passwd 经过Google发现原来是一个文件出现在两个deb包中，运行下面的命令可解决： dpkg --force overwrite -i /var/cache/apt/archives/debianutils_2.22.1_i386.deb