请教unstable发行版问题

bcjr

小弟使用的是unstable时间不长，前一段时间apt-get update;apt-get upgrade 挺好的，最近一个星期升级老是出错误提示,每次冲突的错误提示都不一样，今日升级错误提示如下
[code:1]
dpkg: error processing /var/cache/apt/archives/manpages-dev_2.25-2_all.deb (--unpack):
trying to overwrite `/usr/share/man/man2/create_module.2.gz', which is also in package modutils
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/manpages-dev_2.25-2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
[/code:1]
大虾没有否遇到这种情况呢？该如何处理呢？
看了一些介绍，说unstable就是有很多错误，是不是这样啊？那是否要换成testing哪？
大侠们一般都用什么版本啊？
谢谢赐教！！