Fehler bei Update auf 19.0.5

Hallo, beim Updaten von 19.0.4 auf 19.0.5 bekomme ich immer den folgenden Fehler.
Was mache ich da Falsch?

[ ] Delete old files ...PHP Warning:  unlink(/var/www/nextcloud/apps/accessibility/lib/Service/JSDataService.php): Permission denied in phar:///var/www/nextcloud/updater/updater.phar/lib/Updater.php on line 769
PHP Warning:  rmdir(/var/www/nextcloud/apps/accessibility/lib/Service): Directory not empty in phar:///var/www/nextcloud/updater/updater.phar/lib/Updater.php on line 772
PHP Warning:  rmdir(/var/www/nextcloud/apps/accessibility/lib): Directory not empty in phar:///var/www/nextcloud/updater/updater.phar/lib/Updater.php on line 772
PHP Warning:  rmdir(/var/www/nextcloud/updater/../apps/accessibility): Directory not empty in phar:///var/www/nextcloud/updater/updater.phar/lib/Updater.php on line 775
[✘] Delete old files failed
Could not rmdir /var/www/nextcloud/updater/../apps/accessibility

Update failed. To resume or retry just execute the updater again.

Nextcloud version _19.0.4:
Operating system and version _ Ubuntu 18.04.5: