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Sorry to hear you’re facing problems 
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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:
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, 20.0.5): replace me
Operating system and version (eg, Ubuntu 20.04): Raspberry Pi 4 Bullseye
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.54 (Debian)
PHP version (eg, 7.4): 8.1.10
The issue you are facing:
After an upgrade to Bullseye on Raspberry Pi 4, the web site responds with:
- @author Joas Schilling * @author Jörn Friedrich Dreyer * @author Lukas Reschke * @author Morris Jobke * @author Robin Appelman * @author Roeland Jago Douma * @author Sergio BertolÃn * @author Thomas Müller * @author Vincent Petry * * @license AGPL-3.0 * * This code is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License, version 3, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License, version 3, * along with this program. If not, see * / require_once DIR . ‘/lib/versioncheck.php’; try { require_once DIR . ‘/lib/base.php’; OC::handleRequest(); } catch (\OC\ServiceUnavailableException $ex) { \OC::$server->getLogger()->logException($ex, [‘app’ => ‘index’]); //show the user a detailed error page OC_Template::printExceptionErrorPage($ex, 503); } catch (\OCP\HintException $ex) { try { OC_Template::printErrorPage($ex->getMessage(), $ex->getHint(), 503); } catch (Exception $ex2) { try { \OC::$server->getLogger()->logException($ex, [‘app’ => ‘index’]); \OC::$server->getLogger()->logException($ex2, [‘app’ => ‘index’]); } catch (Throwable $e) { // no way to log it properly - but to avoid a white page of death we try harder and ignore this one here } //show the user a detailed error page OC_Template::printExceptionErrorPage($ex, 500); } } catch (\OC\User\LoginException $ex) { $request = \OC::$server->getRequest(); /* * Routes with the @CORS annotation and other API endpoints should * not return a webpage, so we only print the error page when html is accepted, * otherwise we reply with a JSON array like the SecurityMiddleware would do. */ if (stripos($request->getHeader(‘Accept’), ‘html’) === false) { http_response_code(401); header(‘Content-Type: application/json; charset=utf-8’); echo json_encode([‘message’ => $ex->getMessage()]); exit(); } OC_Template::printErrorPage($ex->getMessage(), $ex->getMessage(), 401); } catch (Exception $ex) { \OC::$server->getLogger()->logException($ex, [‘app’ => ‘index’]); //show the user a detailed error page OC_Template::printExceptionErrorPage($ex, 500); } catch (Error $ex) { try { \OC::$server->getLogger()->logException($ex, [‘app’ => ‘index’]); } catch (Error $e) { http_response_code(500); header(‘Content-Type: text/plain; charset=utf-8’); print(“Internal Server Error\n\n”); print(“The server encountered an internal error and was unable to complete your request.\n”); print(“Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.\n”); print(“More details can be found in the webserver log.\n”); throw $ex; } OC_Template::printExceptionErrorPage($ex, 500); }
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
PASTE HERE
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.
PASTE HERE