错误信息类似于：
start: Job failed to start
invoke-rc.d: initscript statd, action "restart" failed.
dpkg: error processing nfs-common (--configure):
subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of nfs-kernel-server:
nfs-kernel-server depends on nfs-common (>= 1:1.0.8-1); however:
Package nfs-common is not configured yet.
dpkg: error processing nfs-kernel-server (--configure):
dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
Errors were encountered while processing:
nfs-common
nfs-kernel-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
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错误发生在我用ubuntu64位制作mini rootfs时，我chroot后，安装nfs-kernel-server总是报错。
究其原因，是因为portmap没有启动。但是chroot状态无法启动portmap。所以退出来，在ubuntu系统中先安装nfs-kernel-server，即可启动主系统的portmap，然后chroot到mini rootfs，就可以安装nfs-kernel-server 和nfs-common了。
网上有各种解法，均不正确，可能跟我的环境不一样所致。
做个笔记，如果哪位同仁在制作root fs 的时候遇到同样头疼的问题，希望这个笔记可以帮到你。