Comment 45 for bug 1717040

xenial apt upgrade test:
a) zstd, libzstd0, libzstd-dev installed
ubuntu@xenial-zstd-sru-1717040:~$ dpkg-query -W zstd libzstd0 libzstd-dev
libzstd-dev 0.5.1-1
libzstd0 0.5.1-1
zstd 0.5.1-1

ubuntu@xenial-zstd-sru-1717040:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'sudo apt autoremove' to remove it.
The following NEW packages will be installed:
  libzstd1
The following packages will be upgraded:
  zstd
1 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 392 kB of archives.
After this operation, 904 kB of additional disk space will be used.
Do you want to continue? [Y/n]

after:
ubuntu@xenial-zstd-sru-1717040:~$ dpkg -l|grep zstd
ii libzstd-dev 0.5.1-1 amd64 fast lossless compression algorithm -- development files
ii libzstd0 0.5.1-1 amd64 fast lossless compression algorithm
ii libzstd1 1.3.1+dfsg-1~ubuntu0.16.04.1~ppa5 amd64 fast lossless compression algorithm
ii zstd 1.3.1+dfsg-1~ubuntu0.16.04.1~ppa5 amd64 fast lossless compression algorithm -- CLI tool

ubuntu@xenial-zstd-sru-1717040:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  libfreetype6 libzstd0
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  libzstd1
The following packages will be upgraded:
  zstd
1 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 392 kB of archives.
After this operation, 904 kB of additional disk space will be used.
Do you want to continue? [Y/n]

end result:
ubuntu@xenial-zstd-sru-1717040:~$ dpkg -l|grep zstd
ii libzstd0 0.5.1-1 amd64 fast lossless compression algorithm
ii libzstd1 1.3.1+dfsg-1~ubuntu0.16.04.1~ppa5 amd64 fast lossless compression algorithm
ii zstd 1.3.1+dfsg-1~ubuntu0.16.04.1~ppa5 amd64 fast lossless compression algorithm -- CLI tool

c) motd

motd acks the available upgrades:
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-112-generic x86_64)

 * Documentation: https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support: https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

2 packages can be updated.
0 updates are security updates.