Hello,
After upgrading my Ubuntu server to Bionic (18.04) my wiki no longer work (version 1.30.0) .
I was in php 7.1 and now it is 7.2.
It is configured as private wiki with an authentication, i can (sometimes) display the login page but after i got the following php messages in loop:
[07-May-2018 16:36:20 Europe/Paris] PHP Notice: Undefined index: 15.0000000 in /var/www/wiki.astrololo.fr/vendor/wikimedia/base-convert/src/Functions.php on line 87
[07-May-2018 16:36:20 Europe/Paris] PHP Notice: Undefined index: 3.0000000 in /var/www/wiki.astrololo.fr/vendor/wikimedia/base-convert/src/Functions.php on line 87
[07-May-2018 16:36:20 Europe/Paris] PHP Notice: Undefined index: 25.0000000 in /var/www/wiki.astrololo.fr/vendor/wikimedia/base-convert/src/Functions.php on line 87
[07-May-2018 16:36:20 Europe/Paris] PHP Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/wiki.astrololo.fr/vendor/wikimedia/base-convert/src/Functions.php on line 86