Can't update Nextcloud. Getting 412 error in browser console

Nextcloud version (eg, 20.0.5): 21.0.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.41-4ubuntu3.1
PHP version (eg, 7.4): 7.4.3

The issue you are facing:
Can’t update Nextcloud from web. See steps how to replicate it. It always gives me 412 Precondition failed

Is this the first time you’ve seen this error? (Y/N): Yes

Steps to replicate it:

  1. Login to admin account
  2. Go to settings → see that there is new version of nextcloud
  3. Click Open updater → nothing happens
  4. Check browser console
  5. Click again
  6. **myserverurl**/index.php/apps/updatenotification/credentials returns 412 Precondition failed
  7. there are repeating 412 Precondition failed even on **myserverurl**/index.php/apps/user_status/heartbeat

The output of your Nextcloud log in Admin > Logging: I dont’ think there is something there

Error	public	Exception: The requested uri(/.well-known/webfinger) cannot be processed by the script '/drop/public.php')	
2021-06-02T20:26:01+0200
Error	public	Exception: The requested uri(/.well-known/webfinger) cannot be processed by the script '/drop/public.php')	
2021-06-02T20:14:55+0200
Fatal	webdav	Error: Call to a member function getId() on array	
2021-05-31T14:26:09+0200
Error	PHP	Error: Trying to access array offset on value of type bool at /var/www/html/drop/lib/private/Files/Storage/Wrapper/Encryption.php#669	
2021-05-31T14:26:08+0200
Error	PHP	Error: Trying to access array offset on value of type bool at /var/www/html/drop/lib/private/Files/Storage/Wrapper/Encryption.php#441	
2021-05-31T14:25:03+0200
Error	PHP	Error: Trying to access array offset on value of type bool at /var/www/html/drop/lib/private/Files/Storage/Wrapper/Encryption.php#441	
2021-05-31T14:24:00+0200

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '*****',
  'passwordsalt' => '*****',
  'secret' => '*****',
  'trusted_domains' => 
  array (
    0 => '*****',
  ),
  'datadirectory' => '*****',
  'dbtype' => 'mysql',
  'version' => '21.0.1.1',
  'overwrite.cli.url' => '*****',
  'dbname' => '*****',
  'dbhost' => '*****',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '*****',
  'dbpassword' => '*****',
  'installed' => true,
  'mysql.utf8mb4' => true,
  'maintenance' => false,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpauth' => 1,
  'mail_smtpsecure' => 'tls',
  'mail_from_address' => '*****',
  'mail_domain' => '*****',
  'mail_smtphost' => '*****',
  'mail_smtpport' => '587',
  'mail_smtpname' => '*****',
  'mail_smtppassword' => '*****',
  'twofactor_enforced' => 'false',
  'twofactor_enforced_groups' => 
  array (
  ),
  'twofactor_enforced_excluded_groups' => 
  array (
  ),
  'theme' => '',
  'loglevel' => 2,
  'encryption.legacy_format_support' => false,
  'encryption.key_storage_migrated' => false,
  'default_phone_region' => 'CZ',
);

The output of your Apache/nginx/system log in /var/log/____:

nothing relevant just apache restarts I did

bump
nobody?