This app cannot be installed because the following dependencies are not fulfilled: Server version 19 or higher is required.

[userbradley]

When I have tried to isntall the app 'Photos' and enable it I get the error:
'This app cannot be installed because the following dependencies are not fulfilled:
Server version 19 or higher is required.'

I have isntalled it by running git clone https://github.com/nextcloud/photos.git in the /apps folder of nextcloud
I have set the correct permisions for the folder and all subfolders but still get the issue, even after isntalling php-gd and restarting apache2
I am running version 18 of nextcloud on Ubuntu 18.04.3 LTS
Any clue where I've gone wrong?

[skjnldsv]

Hey, the master branch is for nextcloud 19, you might want to check the stable18.
But you do not need to manually install it, this is shipped with nextcloud 18 and automatically updated alongside any nextcloud server update.

[userbradley]

Thanks! I have downloaded and tried the stable18 and it's now picked up the correct version. For some reason it was not installed with my nextcloud version :(
When I added it in I now get the error

The server was unable to complete your request.

If this happens again, please send the technical details below to the server administrator.

More details can be found in the server log.

Technical details
Remote Address: 10.255.255.240
Request ID: oBnBNSfHWGHgmN0X4Fyx
Type: Exception
Code: 0
Message: Class 'OCA\Viewer\Event\LoadViewer' not found
File: /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php
Line: 109

Trace
#0 /var/www/nextcloud/lib/private/AppFramework/App.php(125): OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Photos\Controller\PageController), 'index')
#1 /var/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php(47): OC\AppFramework\App::main('OCA\Photos\Cont...', 'index', Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
#2 [internal function]: OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
#3 /var/www/nextcloud/lib/private/Route/Router.php(299): call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
#4 /var/www/nextcloud/lib/base.php(1008): OC\Route\Router->match('/apps/photos/')
#5 /var/www/nextcloud/index.php(38): OC::handleRequest()
#6 {main}

[userbradley]

Sorry. This can be closed.
I have installed viewer and set the permissions and this seemed to help:
git clone --branch stable18 https://github.com/nextcloud/viewer.git
root@nextcloud:/var/www/nextcloud/apps# chown www-data:www-data viewer/
root@nextcloud:/var/www/nextcloud/apps# chmod -R 755 viewer/
root@nextcloud:/var/www/nextcloud/apps# systemctl restart apache2