R M, the following shows that only two packets were dropped by the firewall by 
hitting default policy:
IPV4 (raw):
Chain INPUT (policy DROP 2 packets, 64 bytes)

All other packets went through. You have additional rules in your ruleset that 
look to be related to libvirt, and they shouldn't cause a problem (I have the 
same rules). What is the output of the ping command after rebooting? Ie, please 
reboot the machine and while it is rebooting, do:
$ ping <ip address>

Let it run for a couple minutes then post the output. Are you able to
SSH into the machine if it is unpingable?

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https://bugs.launchpad.net/bugs/1145070

Title:
  ICMP ping fails without UFW restart

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