Yes, that is expected according to:
https://wiki.ubuntu.com/UAclient#General
"What about releases other than Ubuntu 14.04 LTS?
Support for the client on Ubuntu 16.04 LTS (Xenial)+ is coming."
In other words, "ua" is not available on Xenial.
$ apt-file search /usr/bin/ua
libopengm-bin: /usr/
This also goes for Ubuntu 16.04 LTS.
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https://bugs.launchpad.net/bugs/1857943
Title:
ua command does not exist, can't enable or install from esm
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[Expired for ubuntu-advantage-tools (Ubuntu) because there has been no
activity for 60 days.]
** Changed in: ubuntu-advantage-tools (Ubuntu)
Status: Incomplete => Expired
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Hello,
the "ua" command is available in ubuntu-advantage-tools package from the
trusty-updates pocket, which at the moment is version 19.6~ubuntu14.04.3
You probably have an older version installed, where the ESM support was
via "enable-esm user:pass" command.
** Changed in: ubuntu-advantage-too