Been using nextcloud for years on debian.
Set it and forget it and usually everything works like a champ.
I just did an update but it crapped out and it is currently stuck in maintenance mode.
error shown below:
TemplateLoader.php is shown below:
<?php
declare(strict_types=1);
/**
*
* @copyright Copyright (c) 2018, Daniel Calviño Sánchez (danxuliu@gmail.com)
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Talk\Files;
use OCA\Files\Event\LoadSidebar;
use OCA\Talk\AppInfo\Application;
use OCA\Talk\Config;
use OCA\Talk\TInitialState;
use OCP\App\IAppManager;
use OCP\AppFramework\Services\IInitialState;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\EventDispatcher\IEventListener;
use OCP\Files\IRootFolder;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\IUser;
use OCP\IUserSession;
use OCP\Util;
/**
* Helper class to add the Talk UI to the sidebar of the Files app.
*/
class TemplateLoader implements IEventListener {
use TInitialState;
/** @var IAppManager */
private $appManager;
/** @var IRootFolder */
private $rootFolder;
/** @var IUserSession */
private $userSession;
public function __construct(IInitialState $initialState,
ICacheFactory $memcacheFactory,
Config $talkConfig,
IConfig $serverConfig,
IAppManager $appManager,
IRootFolder $rootFolder,
IUserSession $userSession) {
$this->initialState = $initialState;
$this->memcacheFactory = $memcacheFactory;
$this->talkConfig = $talkConfig;
$this->serverConfig = $serverConfig;
$this->appManager = $appManager;
$this->rootFolder = $rootFolder;
$this->userSession = $userSession;
}
public static function register(IEventDispatcher $dispatcher): void {
$dispatcher->addServiceListener(LoadSidebar::class, self::class);
}
/**
* Loads the Talk UI in the sidebar of the Files app.
*
* This method should be called when handling the LoadSidebar event of the
* Files app.
*
* @param Event $event
*/
public function handle(Event $event): void {
if (!($event instanceof LoadSidebar)) {
return;
}
if ($this->serverConfig->getAppValue('spreed', 'conversations_files', '1') !== '1') {
return;
}
Util::addStyle(Application::APP_ID, 'merged-files');
Util::addScript(Application::APP_ID, 'talk-files-sidebar');
$user = $this->userSession->getUser();
if ($user instanceof IUser) {
$this->publishInitialStateForUser($user, $this->rootFolder, $this->appManager);
} else {
$this->publishInitialStateForGuest();
}
}
}
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 
[/details]
Nextcloud version (eg, 20.0.5): 23.0.0.10
Operating system and version (eg, Ubuntu 20.04): debian 10
Apache or nginx version (eg, Apache 2.4.25): 2.4.38
PHP version (eg, 7.4): 7.3.31-1~deb10u1
The issue you are facing:
Failed update, stuck in maintenance mode
Is this the first time you’ve seen this error? (Y/N): Yes
suggestions on a next step?
Thanks for your time
Qu1nn