25.0.1 - Can't set login background to solid color

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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:

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Or for longer, use three backticks above and below the code snippet:

longer
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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 :heart:

Nextcloud version (eg, 20.0.5): 25.0.1
Operating system and version (eg, Ubuntu 20.04): 20.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 7.4

The issue you are facing:
Login background defaults to Cloud image. Preview in Theming shows correctly.

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

Steps to replicate it:

  1. Set Color in Theming
  2. Remove background and login image
  3. check login screen

The output of your Nextcloud log in Admin > Logging:

OCP\Files\NotPermittedException: Could not create folder

    /var/www/html/nextcloud/lib/private/Files/SimpleFS/SimpleFolder.php - line 106:

    OC\Files\Node\Folder->newFolder()

    /var/www/html/nextcloud/apps/theming/lib/ImageManager.php - line 165:

    OC\Files\SimpleFS\SimpleFolder->newFolder()

    /var/www/html/nextcloud/apps/theming/lib/ImageManager.php - line 180:

    OCA\Theming\ImageManager->getCacheFolder()

    /var/www/html/nextcloud/apps/theming/lib/Controller/IconController.php - line 90:

    OCA\Theming\ImageManager->getCachedImage()

    /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 225:

    OCA\Theming\Controller\IconController->getThemedIcon()

    /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 133:

    OC\AppFramework\Http\Dispatcher->executeController()

    /var/www/html/nextcloud/lib/private/AppFramework/App.php - line 172:

    OC\AppFramework\Http\Dispatcher->dispatch()

    /var/www/html/nextcloud/lib/private/Route/Router.php - line 298:

    OC\AppFramework\App::main()

    /var/www/html/nextcloud/lib/base.php - line 1047:

    OC\Route\Router->match()

    /var/www/html/nextcloud/index.php - line 36:

    OC::handleRequest()

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

<?php
$CONFIG = array (
  'instanceid' => 'randomstuff',
  'passwordsalt' => 'randomstuff',
  'secret' => '+randomstuff',
  'trusted_domains' => 
  array (
    0 => '192.168.1.20',
    1 => 'nextcloud.mydomin.com',
  ),
  'datadirectory' => '/var/www/html/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '25.0.1.1',
  'overwrite.cli.url' => 'http://nextcloud.mydomain.com/nextcloud',
  'overwriteprotocol' => 'https',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => 'randomstuff',
  'installed' => true,
  'trusted_proxies' => 
  array (
    0 => '192.168.1.238',
  ),
  'skeletondirectory' => '',
  'maintenance' => false,
  'updater.secret' => 'randomstuff',
  'theme' => '',
  'loglevel' => 2,
  'tempdirectory' => '/mnt/tmp',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => 'true',
  'auth.bruteforce.protection.enabled' => false,
  'redis' => 
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
);

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

Nov 20 16:06:56 nextcloud systemd[1]: Starting Ubuntu Advantage Timer for running repeated jobs...
Nov 20 16:06:57 nextcloud systemd[1]: ua-timer.service: Succeeded.
Nov 20 16:06:57 nextcloud systemd[1]: Finished Ubuntu Advantage Timer for running repeated jobs.

Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

{"reqId":"Y2lrm2kL0cxD3ulEMJfH","level":3,"time":"2022-11-20T15:46:12+00:00","remoteAddr":"192.168.1.1","user":"nextcloud_user","app":"index","method":"GET","url":"/index.php/apps/theming/img/core/filetypes/file.svg?v=14","message":"Could not create folder","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:107.0) Gecko/20100101 Firefox/107.0","version":"25.0.1.1","exception":{"Exception":"OCP\\Files\\NotPermittedException","Message":"Could not create folder","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/lib/private/Files/SimpleFS/SimpleFolder.php","line":106,"function":"newFolder","class":"OC\\Files\\Node\\Folder","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/ImageManager.php","line":165,"function":"newFolder","class":"OC\\Files\\SimpleFS\\SimpleFolder","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/ImageManager.php","line":180,"function":"getCacheFolder","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/Controller/IconController.php","line":90,"function":"getCachedImage","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":225,"function":"getThemedIcon","class":"OCA\\Theming\\Controller\\IconController","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":133,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":172,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":298,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1047,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/lib/private/Files/Node/Folder.php","Line":165,"CustomMessage":"--"}}