/etc/libvirt/libvirt.conf is in libvirt-clients 4.0.0-1ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This can be used to setup URI aliases for frequently
# used connection URIs. Aliases may contain only the
# characters a-Z, 0-9, _, -.
#
# Following the '=' may be any valid libvirt connection
# URI, including arbitrary parameters
#uri_aliases = [
# "hail=qemu+ssh://root@hail.cloud.example.com/system",
# "sleet=qemu+ssh://root@sleet.cloud.example.com/system",
#]
#
# These can be used in cases when no URI is supplied by the application
# (@uri_default also prevents probing of the hypervisor driver).
#
#uri_default = "qemu:///system"
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