Zimbra setup issue with LDAP

[BnW]

Today I try to install ZCS 7.1.4_GA on Amazon EC2 Micro Instance with Ubuntu 10 OS. However there are some issues:
1. I found error log "This is the ldap master and ldap hasn't been configured yet" during the installation.
2. The installation process hang quite long (some hours) at line "Save config in file: [/opt/zimbra/config.6794]" and could not finnish.

Following are some information about the system:
dig cloudedcore.com any

; <<>> DiG 9.7.0-P1 <<>> cloudedcore.com any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27357
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;cloudedcore.com.               IN      ANY

;; ANSWER SECTION:
cloudedcore.com.        604800  IN      SOA     mail.cloudedcore.com. admin.cloudedcore.com. 70725 604800 86400 2419200 604800
cloudedcore.com.        604800  IN      NS      mail.cloudedcore.com.
cloudedcore.com.        604800  IN      MX      10 mail.cloudedcore.com.
cloudedcore.com.        604800  IN      A       10.242.203.90

;; ADDITIONAL SECTION:
mail.cloudedcore.com.   604800  IN      A       10.242.203.90

;; Query time: 0 msec
;; SERVER: 10.242.203.90#53(10.242.203.90)
;; WHEN: Fri Apr  6 17:51:13 2012
;; MSG SIZE  rcvd: 142

dig cloudedcore.com mx

; <<>> DiG 9.7.0-P1 <<>> cloudedcore.com mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45291
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;cloudedcore.com.               IN      MX

;; ANSWER SECTION:
cloudedcore.com.        604800  IN      MX      10 mail.cloudedcore.com.

;; AUTHORITY SECTION:
cloudedcore.com.        604800  IN      NS      mail.cloudedcore.com.

;; ADDITIONAL SECTION:
mail.cloudedcore.com.   604800  IN      A       10.242.203.90

;; Query time: 0 msec
;; SERVER: 10.242.203.90#53(10.242.203.90)
;; WHEN: Fri Apr  6 17:52:08 2012
;; MSG SIZE  rcvd: 84

host `hostname`

mail.cloudedcore.com has address 10.242.203.90

cat /etc/resolv.conf

nameserver 10.242.203.90
domain cloudedcore.com

cat /etc/hosts

127.0.0.1 localhost.localdomain localhost
10.242.203.90 mail.cloudedcore.com mail

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

I have been google for 4 hours and read various threads over forums but could not solve it.
Could you please help me to solve out these issues. Thanks for your kindness.

[justdave]

Maybe a stupid question, but did you enable the zimbra-ldap component in the questions at the top of the install script?