Just ran into this problem as well! I thought my upgrade to Ubuntu 16.04 (with MySQL 5.7 and PHP7) had borked WordPress entirely but then managed to track it down to this plugin. Once I disabled it, everything started working again.
The problem is this:
PHP Fatal error: Uncaught Error: Call to undefined function eregi_replace() in /var/www/public/blog/wp-content/plugins/link-indication/link-indication.php:315
eregi_replace() was removed in PHP7:
https://secure.php.net/manual/en/function.eregi-replace.php
I got the plugin working by changing this line:
$final_stuff = eregi_replace(':space:+', ' ', $final_stuff);
to this:
$final_stuff = preg_replace('/:space:+/', ' ', $final_stuff);
