Debian 4 package - LDAP and JVM error

[soeren]

Starting servers...Could not create the Java virtual machine.
Unable to determine enabled services from ldap.
Enabled services read from cache. Service list may be inaccurate.
Password:

This is what I get at the end of my installation. I have no idea what password it's asking me for..
MX record is set correctly, I've checked the hosts file and no other errors are thrown.
I've removed Zimbra, checked whether all processes were dead and reinstalled, only to get the same error again.

[phoenix]

How much RAM is there on this server? Is it a real server or a VM?

[soeren]

Its a VM, so it probably doesn't have enough memory. Well, I guess then I'll just use the good old Postfix on its own..

[phoenix]

How much memory does it have?

[soeren]

It's dynamic and I think it starts at 256MB. It's not my server, so I'm not quite sure.

[phoenix]

That's far too low for even a test server and burst memory causes problems. The system requirements are documented here.