ubuntu@vm1:~/literaturemgmt/SciBib$ bin/cake users addSuperuser
PHP Warning:  Module 'intl' already loaded in Unknown on line 0
Exception: Database driver Cake\Database\Driver\Mysql cannot be used due to a missing PHP extension or unmet dependency in [/home/ubuntu/literaturemgmt/SciBib/vendor/cakephp/cakephp/src/Database/Connection.php, line 170]
ubuntu@vm1:~/literaturemgmt/SciBib$ 

ubuntu@vm1:~/literaturemgmt/SciBib$ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - cakephp/cakephp 3.3.9 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.8 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.7 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.6 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.5 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.4 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.3 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.2 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.12 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.11 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.10 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.1 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.3.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.9 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.8 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.7 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.6 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.5 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.4 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.3 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.2 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.14 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.13 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.12 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.11 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.10 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.1 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.2.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.9 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.8 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.7 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.6 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.5 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.4 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.3 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.2 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.14 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.13 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.12 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.11 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.10 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.1 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.1.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - Installation request for cakephp/cakephp ~3.1 -> satisfiable by cakephp/cakephp[3.1.0, 3.1.1, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.2.0, 3.2.1, 3.2.10, 3.2.11, 3.2.12, 3.2.13, 3.2.14, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7, 3.2.8, 3.2.9, 3.3.0, 3.3.1, 3.3.10, 3.3.11, 3.3.12, 3.3.2, 3.3.3, 3.3.4, 3.3.5, 3.3.6, 3.3.7, 3.3.8, 3.3.9].

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.0/cli/php.ini
    - /etc/php/7.0/cli/conf.d/10-opcache.ini
    - /etc/php/7.0/cli/conf.d/10-pdo.ini
    - /etc/php/7.0/cli/conf.d/20-calendar.ini
    - /etc/php/7.0/cli/conf.d/20-ctype.ini
    - /etc/php/7.0/cli/conf.d/20-exif.ini
    - /etc/php/7.0/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.0/cli/conf.d/20-ftp.ini
    - /etc/php/7.0/cli/conf.d/20-gettext.ini
    - /etc/php/7.0/cli/conf.d/20-iconv.ini
    - /etc/php/7.0/cli/conf.d/20-json.ini
    - /etc/php/7.0/cli/conf.d/20-phar.ini
    - /etc/php/7.0/cli/conf.d/20-posix.ini
    - /etc/php/7.0/cli/conf.d/20-readline.ini
    - /etc/php/7.0/cli/conf.d/20-shmop.ini
    - /etc/php/7.0/cli/conf.d/20-sockets.ini
    - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.0/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.0/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.0/cli/conf.d/20-tokenizer.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
ubuntu@vm1:~/literaturemgmt/SciBib$ 

Warning (512): SplFileInfo::openFile(/var/www/html/tmp/cache/models/myapp_cake_model_default_users): failed to open stream: Permission denied [CORE/src/Cache/Engine/FileEngine.php, line 398]

Warning (512): SplFileInfo::openFile(/var/www/html/tmp/cache/models/myapp_cake_model_default_users) [<a href='http://php.net/splfileinfo.openfile'>splfileinfo.openfile</a>]: failed to open stream: Permission denied [CORE/src/Cache/Engine/FileEngine.php, line 398]

Warning (512): _cake_model_ cache was unable to write 'default_users' to DebugKit\Cache\Engine\DebugEngine cache [CORE/src/Cache/Cache.php, line 248]

Warning (2): Cannot modify header information - headers already sent by (output started at /var/www/html/vendor/cakephp/cakephp/src/Error/Debugger.php:754) [CORE/src/Network/Session.php, line 563]

Warning (2): session_regenerate_id() [<a href='http://php.net/function.session-regenerate-id'>function.session-regenerate-id</a>]: Cannot regenerate session id - headers already sent [CORE/src/Network/Session.php, line 567]