Mautic 3.3.3 → 3.3.4 → 4.0.0
My PHP version is : 7.4
My MySQL/MariaDB version is (delete as applicable): mysql Ver 15.1 Distrib 10.3.31-MariaDB
I am (delete as applicable): Updating
Upgrading/installing via (delete as applicable) : Command Line
These errors are showing in the installer : None
These errors are showing in the Mautic log :
[2021-09-01 10:10:48] mautic.ERROR: Symfony\Component\Filesystem\Exception\IOException: Cannot rename "/tmp/UrlGenerator.phpPDIDgu" to "/var/log/mautic/cache/prod/UrlGenerator.php". - in file /var/www/mautic/vendor/symfony/filesystem/Filesystem.php - at line 290  
My problem is : Upgrade from 3.3.3 says all is good i am now running 3.3.4! \o/
go to webpage: everything is broken /o\
“The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.”
Oh no! i am system administrator!
Try to upgrade from there to 4.0.0 because no one told me i would have to upgrade to 3.3.4 first and maybe it’s just an intermediary
Upgrade from 3.3.4 says all is good i am now running 4.0.0! \o/
Go to page: everything is borken, same error message. /o\
Steps I have tried to fix the problem : Pull hair, look into logs, despair.