So I migrated our data to a new server which already had 8.8.9 on it, but it fails to upgrade (probably because it thinks it's upgrading 8.8.9 to 8.8.9 but then it finds 8.0.6 data):
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Downgrading to ZCS upgrade from 8.8.9 to 8.8.9 will be performed.
Validating ldap configuration
/usr/bin/perl: symbol lookup error: /opt/zimbra/zimbramon/lib/x86_64-linux-thread-multi-auto/IO/IO.so: undefined symbol: Perl_Istack_sp_ptr
Unknown Error: It should be impossible to reach this statement.
So I now think we need to set up our new server on 8.0.6, migrate data, and upgrade from 8.0.6 to 8.8.9 there, or am I missing a simpler path? Is there an easy way to fix the error above? As suggested in another forum thread, I tried "# ./install.sh -s" but that didn't change anything, nor did "yum reinstall zimbra-perl-*"