This became a complex issue on our legacy Ubuntu 8.04 64-bit server which we had to solve. We had to solve it because Postfix is the standard on all our servers and we have well established SNMP monitoring for Postfix Deferred queue, which typically alerts us when a hacker has compromised our server (normally a CMS, Joomla, outdated Joomla and / or Joomla Modules).
The actual file in question is
agriculture-pack1_4.5.0.20081222-1_all.deb
and a quick Google pointed to this to
http://plesk-autoinstall.mirror.ser..._4.5.0/dist-deb-Ubuntu-8.04-x86_64/templates/
So it seems that actually agriculture-pack1 is part of sitebuilder, some kind of templates for creating agriculture websites.
Every time we tried to upgrade Plesk this file gave an error. To get past this error the solution was to
apt-get remove sitebuilder
However, thereafter Plesk still wouldn't switch to Postfix because Ubuntu 8.04 is not longer supported. Even changing
to point to legacy
didn't work because 8.04 is a few months out of 5 year support.
The final solution, after getting rid of the agriculture1 problem, was to mount an Ubuntu 8.04 ISO CD and point sources.list to it. For example, on our system we changed all instances of
to
deb file:/media/ubuntu804/ hardy main restricted
Full procedure for mounting ISO as apt source is here:
http://linuxconfig.org/add-iso-image-to-apt-sourceslist
Thereafter Plesk could be switched from Qmail to Postfix.
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