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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 20.0.2
Operating system and version (eg, Ubuntu 20.04): Centos 7.8
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.1): 7.4
The issue you are facing:
Strange garbage on screen after upgrading
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Upgrade to NC 20.0.2 via web interface
- Finish upgrade
- Go to site
The output of your Nextcloud log in Admin > Logging:
Can't get into interface to check
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'redacted',
'passwordsalt' => 'verysalty',
'secret' => '-------',
'trusted_domains' =>
array (
0 => '',
),
'datadirectory' => '/home/phil/cloud/data',
'dbtype' => 'mysql',
'version' => '20.0.2.2',
'overwrite.cli.url' => 'https://serveraddress/newcloud',
'dbname' => 'newcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'dbuser',
'dbpassword' => 'secretdbpassword',
'installed' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
==> ../../logs/access_log <==
xx.xxx.xxx.xx - - [27/Nov/2020:11:55:46 +0100] "GET /newcloud/ HTTP/1.1" 302 - "-" "Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0"
xx.xxx.xxx.xxx - - [27/Nov/2020:11:55:47 +0100] "GET /newcloud/index.php/login HTTP/1.1" 200 4409 "-" "Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0"