Comment 65 for bug 1717040

RELEASE UPGRADE FROM XENIAL TO ARTFUL
- starting with the 1.3.1 dev package in xenial

PASS

root@xenial2artful:~# 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 amd64 fast lossless compression algorithm
ii libzstd1-dev 1.3.1+dfsg-1~ubuntu0.16.04.1 amd64 fast lossless compression algorithm -- development files
ii zstd 1.3.1+dfsg-1~ubuntu0.16.04.1 amd64 fast lossless compression algorithm -- CLI tool

Details of upgrade:
Install: libzstd-dev
Upgrade: libzstd1 libzstd1-dev zstd

At the end:
Remove (was auto installed) libpython3.5 libzstd0 libzstd1-dev

end result (transitional package was removed):
root@xenial2artful:~# dpkg -l|grep zstd
ii libzstd-dev 1.3.1+dfsg-1ubuntu0.1 amd64 fast lossless compression algorithm -- development files
ii libzstd1 1.3.1+dfsg-1ubuntu0.1 amd64 fast lossless compression algorithm
ii zstd 1.3.1+dfsg-1ubuntu0.1 amd64 fast lossless compression algorithm -- CLI tool

Confirming proposed was used in the release upgrade:
root@xenial2artful:~# apt-cache policy zstd
zstd:
  Installed: 1.3.1+dfsg-1ubuntu0.1
  Candidate: 1.3.1+dfsg-1ubuntu0.1
  Version table:
 *** 1.3.1+dfsg-1ubuntu0.1 500
        500 http://br.archive.ubuntu.com/ubuntu artful-proposed/universe amd64 Packages
        100 /var/lib/dpkg/status
     1.3.1+dfsg-1 500
        500 http://br.archive.ubuntu.com/ubuntu artful/universe amd64 Packages