Error after upgrading from ubuntu 16.04 to 18.04

[maxlehot1234]

Hi, I install zabbix "prebuild" but after the upgrade to ubuntu 18.04, zabbix dashboard on.ly display php files and no more frontend

https://i.imgur.com/lIMy9pa.png

Do you have an idea for this or how I can fix this issue?

Thanks again everyone and have a nice day/night to you