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Cron Using the operating system cron feature is the preferred method for executing regular tasks. This method enables the execution of scheduled jobs without the inherent limitations the Web server might have. To run a cron job on a *nix system, every 5 minutes, under the default Web server user (often, www-data or wwwrun), you must set up the following cron job to call the cron.php script: sudo crontab -e -u www-data */5 * * * * php -f /var/www/cloud.kc-linux.com/html/cron.php */5 * * * * /usr/bin/php /var/www/cloud.kc-linux.com/html/occ preview:pre-generate > /dev/null 2>&1 You can verify if the cron job has been added and scheduled by executing: crontab -u www-data -l If Cron isn't working and you are getting an error under nextcloud basic setting about site not running back ground processes. go to /etc/php/{{ php_version }}/mods-available/apcu.ini and add the below. apc.enable_cli=1 Once added run: sudo -u www-data php -f /var/www/nexcloud/cron.php If it completes without errors it's working.

Open super user bash sudo bash Go to the NextCloud folder: cd /var/www/nextcloud Run the following command: sudo -u www-data php occ db:add-missing-indices And finally the prompt should show something like this: Check indices of the share table. Adding additional parent index to the share table, this can take some time… Share table updated successfully. Adding additional mtime index to the filecache table, this can take some time… Filecache table updated successfully. And that's all, the problem should being fixed

Accessing a Gmail Account from Nextcloud Due to Google's security policies, accessing your Gmail account from Nextcloud requires additional steps. If you use two factor authentication, you'll need to generate an app password: Visit https://myaccount.google.com/apppasswords from a web browser At the bottom of the page, click the drop-down box labeled "Select app" Choose the option, "Other (Custom name)" Enter a descriptive name, such as "Nextcloud Mail" Click "Generate" Go back to Nextcloud (Mail/Rainloop), and enter your e-mail address and the app password you just generated Your Gmail account should now be accessible from within Nextcloud If you are not using two factor authentication, you'll need to allow "Less Secure Apps": Visit https://myaccount.google.com/lesssecureapps Toggle the radio button "Allow less secure apps" to the "ON" position Go back to Nextcloud (Mail/Rainloop), and enter your e-mail address and Google password Your Gmail account should now be accessible from within Nextcloud

To enable preview for files in nextcloud, you need to install “Preview Generator” from next cloud app store https://apps.nextcloud.com/apps/previewgenerator To install login to nextcloud as admin. From right drop down menu, click + Apps link. Once on Apps page, you can use the search button on right side to search for "Preview Generator" and install it. You need to install some additional software, on ubuntu/debian install it with sudo apt install libreoffice ffmpeg imagemagick ghostscript Now edit config/config.php file of your nextcloud installation, add following code 'enable_previews' => true, 'preview_libreoffice_path' => '/usr/bin/libreoffice', 'enabledPreviewProviders' => array ( 0 => 'OC\\Preview\\TXT', 1 => 'OC\\Preview\\MarkDown', 2 => 'OC\\Preview\\OpenDocument', 3 => 'OC\\Preview\\PDF', 4 => 'OC\\Preview\\MSOffice2003', 5 => 'OC\\Preview\\MSOfficeDoc', 6 => 'OC\\Preview\\PDF', 7 => 'OC\\Preview\\Image', 8 => 'OC\\Preview\\Photoshop', 9 => 'OC\\Preview\\TIFF', 10 => 'OC\\Preview\\SVG', 11 => 'OC\\Preview\\Font', 12 => 'OC\\Preview\\MP3', 13 => 'OC\\Preview\\Movie', 14 => 'OC\\Preview\\MKV', 15 => 'OC\\Preview\\MP4', 16 => 'OC\\Preview\\AVI', ), For more info on configuration, check nextcloud documenation. Generate Preview for existing files Lets generate thumbnail for existing files, for this, I enabled shell access for www-data so preview files have proper file ownership (not owned by root). chsh --shell /bin/bash www-data Now change to www-data user su - www-data Now run: (Without www-data) sudo -u www-data php /var/www/cloud.kc-linux.com/html/occ preview:generate-all -vvv or (with switching to www-data user) /usr/bin/php /var/www/nextcloud/occ preview:generate-all -vvv Autogenerate Previews for new files set a cronjob as user www-data crontab -e -u www-data */5 * * * * /usr/bin/php /var/www/nextcloud/occ preview:pre-generate > /dev/null 2>&1