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nova.compute.manager [instance: a8acc7f4-e060-48fa-9d83-452c5df0ab69] qemu: at most 2047 MB RAM

I think you are trying to boot an instance with a flavor which has 2GB RAM.

The Ubuntu machine (on which you installed openstack) created on Virtual box might not have 2GB free RAM.

Try with a smaller flavor, ex - tiny flavor, the nova boot should work