Just use apt-cache policy to find the repo of a package:

apt-cache policy lxd
lxd:
  Installed: 3.0.3-0ubuntu1~18.04.2
  Candidate: 3.0.3-0ubuntu1~18.04.2
  Version table:
 *** 3.0.3-0ubuntu1~18.04.2 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.0.0-0ubuntu4 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages


Or use apt show

apt show lxd
Package: lxd
Version: 3.0.3-0ubuntu1~18.04.2
Built-Using: golang-1.10 (= 1.10.4-2ubuntu1~18.04.2)
Priority: optional
Section: admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 20.6 MB
Depends: acl, adduser, dnsmasq-base, ebtables, iproute2, iptables, liblxc1 (>= 2.1.0~), lsb-base (>= 3.0-6), lxcfs, lxd-client (= 3.0.3-0ubuntu1~18.04.2), passwd (>= 1:4.1.5.1-1ubuntu5~), rsync, squashfs-tools, uidmap (>= 1:4.1.5.1-1ubuntu5~), xdelta3, xz-utils, libacl1 (>= 2.2.51-8), libc6 (>= 2.14), libuv1 (>= 1.4.2)
Recommends: apparmor
Suggests: criu, lxd-tools
Homepage: https://linuxcontainers.org/
Task: cloud-image, server
Supported: 5y
Download-Size: 5,199 kB
APT-Manual-Installed: yes
APT-Sources: http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
Description: Container hypervisor based on LXC - daemon
 LXD offers a REST API to remotely manage containers over the network,
 using an image based workflow and with support for live migration.
 .
 This package contains the LXD daemon.

N: There is 1 additional record. Please use the '-a' switch to see it


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