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Do you have a log file that we can look at?
Typically, they're located in /tmp/install.log.xxx
Here was the log info :
dpkg: error processing ./packages/zimbra-core_4.5.4_GA_763.UBUNTU6_i386.deb (--install):
package architecture (i386) does not match system (amd64)
Errors were encountered while processing:
./packages/zimbra-core_4.5.4_GA_763.UBUNTU6_i386.deb