Github user serg38 commented on the issue: https://github.com/apache/cloudstack/pull/1696 @jburwell @rhtyd I apologies. The issue in our environment was due to using ESX v6. Once I added new mapping for it Vmware properly assigned Os type. It would be nice to officially certify ESX6 for ACS. It has been a supported platform for one of the commercial distribution for some time already. INSERT IGNORE INTO `cloud`.`guest_os_hypervisor` (uuid,hypervisor_type, hypervisor_version, guest_os_name, guest_os_id, created, is_user_defined) VALUES (UUID(),'VMware', '6.0', 'ubuntuGuest', 255, utc_timestamp(), 0); INSERT IGNORE INTO `cloud`.`guest_os_hypervisor` (uuid,hypervisor_type, hypervisor_version, guest_os_name, guest_os_id, created, is_user_defined) VALUES (UUID(),'VMware', '6.0', 'ubuntu64Guest', 256, utc_timestamp(), 0);
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