Blank Page after upgrading PHP

Help
1

My exisiting installations are all failing with a blank page instead of the login page after upgrading to PHP7.2. I’ve tried all the suggested fixes out there and nothing seems to work. This is happening on multiple installations in production.
Here is an example validation output:

Component Version
LibreNMS 1.49
DB Schema 2019_02_10_220000_add_dates_to_fdb (132)
PHP 7.2.15-1+ubuntu18.04.1+deb.sury.org+1
MySQL 10.1.38-MariaDB-0ubuntu0.18.04.1
RRDTool 1.7.0
SNMP NET-SNMP 5.7.3
====================================

[OK] Composer Version: 1.8.4
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[WARN] Your local git contains modified files, this could prevent automatic updates.
[FIX]:
You can fix this with ./scripts/github-remove
Modified Files:
storage/framework/cache/data/.gitignore

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2

Most of this time, it is because your webserver is still using the old php version…

3

Thank you. I just managed to figure that out. For anybody else what I had to do is remove the old PHP versions and then, at least on one system, I had to manually install mysqlnd