/etc/libvirt/libvirt-admin.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 admin connection
# URI, including arbitrary parameters
#uri_aliases = [
# "admin=libvirtd:///system",
#]
# This specifies the default location the client tries to connect to if no other
# URI is provided by the application
#uri_default = "libvirtd:///system"
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