php-uploadprogress is not available by default on Ubuntu 16.
sudo apt-get install php-uploadprogress
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package php-uploadprogress is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source
E: Package 'php-uploadprogress' has no installation candidate
What is the best way of installing so that any updates will be installed in the future?
I found a possible solution...
https://www.drupal.org/node/2718253
You can also try...
With this PPA the installation of the upload progressbar for PHP 7 should work also.
sudo add-apt-repository ppa:ondrej/php
Followed up by this command
sudo apt-get update
Then the uploadprogress for PHP7 can be installed via:
sudo apt-get install php-uploadprogress