root@test-bionic:~# apt policy ubuntu-advantage-tools
ubuntu-advantage-tools:
  Installed: 27.13.1~18.04.1
  Candidate: 27.13.1~18.04.1
  Version table:
 *** 27.13.1~18.04.1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     17 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
root@test-bionic:~# apt policy update-notifier-common
update-notifier-common:
  Installed: 3.192.1.15
  Candidate: 3.192.1.15
  Version table:
 *** 3.192.1.15 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.192 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
root@test-bionic:~# /usr/lib/update-notifier/apt-check --human-readable
0 updates can be applied immediately.
root@test-bionic:~# echo "deb http://archive.ubuntu.com/ubuntu bionic-proposed main" | tee /etc/apt/sources.list.d/proposed.list
deb http://archive.ubuntu.com/ubuntu bionic-proposed main
root@test-bionic:~# apt update
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]      
Get:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [83.3 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic-proposed InRelease [242 kB]
Get:6 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages [151 kB]
Get:7 http://archive.ubuntu.com/ubuntu bionic-proposed/main Translation-en [34.1 kB]
Fetched 688 kB in 3s (226 kB/s)         
Reading package lists... Done
Building dependency tree       
Reading state information... Done
14 packages can be upgraded. Run 'apt list --upgradable' to see them.
root@test-bionic:~# apt install update-notifier-common
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
The following packages will be upgraded:
  update-notifier-common
1 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.
Need to get 173 kB of archives.
After this operation, 1024 B disk space will be freed.
Get:1 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 update-notifier-common all 3.192.1.18 [173 kB]
Fetched 173 kB in 1s (131 kB/s)                  
(Reading database ... 36141 files and directories currently installed.)
Preparing to unpack .../update-notifier-common_3.192.1.18_all.deb ...
Unpacking update-notifier-common (3.192.1.18) over (3.192.1.15) ...
Setting up update-notifier-common (3.192.1.18) ...
root@test-bionic:~# apt policy update-notifier-common
update-notifier-common:
  Installed: 3.192.1.18
  Candidate: 3.192.1.18
  Version table:
 *** 3.192.1.18 500
        500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     3.192.1.15 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
     3.192 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
root@test-bionic:~# /usr/lib/update-notifier/apt-check --human-readable
Expanded Security Maintenance for Applications is not enabled.

13 updates can be applied immediately.
To see these additional updates run: apt list --upgradable

6 additional security updates can be applied with ESM Apps.
Learn more about enabling ESM Apps service at https://ubuntu.com/esm
root@test-bionic:~#