mailman installation failing

[MR ZenWiz]

On Thu, Jan 13, 2011 at 9:10 AM, Noah <noah-list at enabled.com> wrote:
> Hi there,
>
> Looks like apt-get is attempting to downgrade mailman, any clues why this is
> happening?  And also why it is failing.  Also the Machine is a 32 bit
> machine so I am trying to figure out why
> mailman_1%3a2.1.9-9ubuntu1.2_amd64.deb was ever installed in the first
> place.
>
> # apt-get upgrade
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> The following packages will be upgraded:
>  mailman
> 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
> 12 not fully installed or removed.
> Need to get 0B/8613kB of archives.
> After this operation, 0B of additional disk space will be used.
> Do you want to continue [Y/n]? y
> Preconfiguring packages ...
> (Reading database ... 46764 files and directories currently installed.)
> Preparing to replace mailman 1:2.1.9-9ubuntu1.1 (using
> .../mailman_1%3a2.1.9-9ubuntu1.2_amd64.deb) ...
>  * Stopping Mailman master qrunner mailmanctl
>       [ OK ]
> dpkg: error processing
> /var/cache/apt/archives/mailman_1%3a2.1.9-9ubuntu1.2_amd64.deb (--unpack):
>  subprocess pre-installation script returned error exit status 1
> Downgrade detected, from version 0x2010bf0 to version 0x20109f0
> This is probably not safe.
> Exiting.
>

This appears to be an upgrade using local cached archives, in which
case it appears that your local cached copy of the newer mailman is
corrupt.  You may want to run 'apt-get clean' and then try the upgrade
again.