Success migration:
XEN virtual mashines multiserver install
Step 1:
On ubuntu 8.04 ZCS 7.1.4 -> ZCS 7.2.0

Step 2:
apt-get install update-core-manager
mv /etc/init.d/zimbra ~/
do-release upgrade
replies:
safe limits.conf
new /etc/services
safe securetty
new pam
safe sysctl.conf
safe syslog.confl
reboot
apt-get install libperl5.10 netcat-openbsd
mv ~/zimbra /etc/init.d/
./install.sh
dont't check database on store servers