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Hello,

I got the same error and with help from Fuel IRC channel, I was able to solve it:

Before running update-prepare prepare master, run these commands to pass the deadlock:

systemctl stop nailgun assassind receiverd oswl_flavor_collectord oswl_image_collectord oswl_keystone_user_collectord oswl_tenant_collectord oswl_vm_collectord oswl_volume_collectord receiverd statsenderd
systemctl stop postgresql
systemctl start postgresql
manage.py syncdb
systemctl start nailgun assassind receiverd oswl_flavor_collectord oswl_image_collectord oswl_keystone_user_collectord oswl_tenant_collectord oswl_vm_collectord oswl_volume_collectord receiverd statsenderd

Then go back to step 6 and run update-prepare prepare master.