Sorry, I mistaken this very old bug with a similar one that affects xenial, which I reported here: https://bugs.launchpad.net/ubuntu/+source/moodle/+bug/1695466
This one was probably a dependency problem with libphp-pclzip. Mine, on Xenial, is a dependency problem with php-zip (which was previously a part of the php5 package).
Sorry, I mistaken this very old bug with a similar one that affects xenial, which I reported here: https:/ /bugs.launchpad .net/ubuntu/ +source/ moodle/ +bug/1695466
This one was probably a dependency problem with libphp-pclzip. Mine, on Xenial, is a dependency problem with php-zip (which was previously a part of the php5 package).