"Downgrade" versions?

[Jon Hughes <jonrhughes@yahoo.com>]

Well, we made a booboo:)  My brother was attempting an
innocent apt-get upgrade, however, he accidently
missed an "unstable" line in his sources.list file. 
The result is now that he has some WOODY files sitting
ont he computer and it's causing problems.

Is there anyway, other then removing the OS and
starting over, to "downgrade" back to slink before
this mistake occured?

thanks
jon


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