I followed the wiki instructions and obtain the following errors :
Preparing to upgrade zenoss.
Your system is not yet ready for upgrade. Please install ZenPacks.zenoss.PreUpgrade30 and let it run to completion before continuing the upgrade.
If you have installed the ZenPack already, the preparation is not yet complete. Check the event console or /usr/local/zenoss/zenoss/log/zencatalog.log for progress. You can also ensure the upgrade script is still running with:
zencatalog restart
dpkg: error processing /var/cache/apt/archives/zenoss-stack_3.1.0-0_i386.deb (--unpack):
subprocess pre-installation script returned error exit status 1
Problem running post-install step. Installation may not complete correctly
Error renaming /usr/local/zenoss/mysql/my.cnf-backup to /usr/local/zenoss/mysql/my.cnf
Preparing to upgrade zenoss.
Your system is not yet ready for upgrade. Please install ZenPacks.zenoss.PreUpgrade30 and let it run to completion before continuing the upgrade.
If you have installed the ZenPack already, the preparation is not yet complete. Check the event console or /usr/local/zenoss/zenoss/log/zencatalog.log for progress. You can also ensure the upgrade script is still running with:
zencatalog restart
dpkg: error processing /var/cache/apt/archives/zenoss-stack_3.1.0-0_i386.deb (--unpack):
subprocess pre-installation script returned error exit status 1
Problem running post-install step. Installation may not complete correctly
Error renaming /usr/local/zenoss/mysql/my.cnf-backup to /usr/local/zenoss/mysql/my.cnf
^Cdpkg: error while cleaning up:
subprocess post-installation script killed by signal (Interrupt)
Errors were encountered while processing:
/var/cache/apt/archives/zenoss-stack_3.1.0-0_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@ZenOSS:~#