[libvirt-users] VM bootup got failed with systemd/dbus error messages

We are having one server machine (ubuntu 16.04 OS) with 10 VMs. When the server is rebooted, some VMs got failed to boot with systemd/dbus error messages. Rebooting the affected VMs resolves this issue. Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.DisplayManager': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.NetworkManager': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.login1': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.Accounts': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.Avahi': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to NameOwnerChanged signal for 'org.freedesktop.ModemManager1': Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to subscribe to activation signal: Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to register name: Connection timed out Jan 30 20:40:02 VM systemd[1]: Failed to set up API bus: Connection timed out an 30 20:40:32 VM dbus[1009]: [system] Failed to activate service 'org.freedesktop.systemd1': timed out Jan 30 20:40:32 VM systemd-logind[998]: Failed to enable subscription: Failed to activate service 'org.freedesktop.systemd1': timed out Jan 30 20:40:32 VM systemd-logind[998]: Failed to fully start up daemon: Connection timed out Host machine specifications:- OS : Ubuntu 16.04 Kernel : 4.15.0-47-generic CPUs : 48 ( 2*12*2) RAM : 64G VM specifications:- OS : Ubuntu 16.04 Kernel : 4.13.16 CPUs : 8 RAM : 4G Attached the full log file. Kindly help us to resolve this issue with a permanent fix. *With Best Regards,* M A PRIYANKA VVDN Technologies Pvt Ltd *Cell : * +91 8489574081 | *Skype :* priyankamathavan27 -- _Disclaimer: _© 2019 VVDN Technologies Pvt. Ltd. This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful.__