Hello everybody,
i solve the problem i have had the wrong ioncube loader in following directories
/etc/php/7.0/apache2/conf.d/
/etc/php/7.0/cgi/conf.d
/etc/php/7.0/cli/conf.d
/etc/php/7.0/fpm/conf.d
i deleded as decribe the wrong ioncube-loader.ini
and put a new right ioncube-loader.ini in...
I have the same problem,
after update to 18.0.28 every 30 minutes i get the message:
Cron <root@server2> [ -x /usr/lib/php/sessionclean ] && /usr/lib/php/sessionclean
Failed loading /usr/lib/php/20151012/ioncube_loader_lin_7.2.so: /usr/lib/php/20151012/ioncube_loader_lin_7.2.so: undefined...