Composer-Update Antwort konnte nicht decodiert werden: zlib_decode (): Datenfehler

vor kurzem habe ich meine Entwicklungsumgebung von Windows auf Linux umgestellt. Ich habe einen Lampenserver mit phpmyadmin eingerichtet und Composer mit installiertsudo apt-get install composer

Dann versuchte ich es sudo composer update -vvv aus meinem Projekt heraus und erhielt die folgende Ausgabe

Reading ./composer.json Loading config file ./composer.json Checking CA file /etc/ssl/certs/ca-certificates.crt Executing command (/var/www/mysite): git branch --no-color --no-abbrev -v Executing command (/var/www/mysite): git describe --exact-match --tags Failed to initialize global composer: Composer could not find the config file: /home/me/.composer/composer.json To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section Reading /var/www/mysite/vendor/composer/installed.json Loading plugin yii\composer\Plugin Loading composer repositories with package information Downloading https://packagist.org/packages.json Writing /home/me/.composer/cache/repo/https---packagist.org/packages.json into cache Updating dependencies (including require-dev) Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2013.json from cache Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2014.json from cache Downloading http://packagist.org/p/provider-2015%245eb5546eae20b24d9d7952a55183a90ee45ca1a1be5c5061e9c36c5cb7c55396.json  Failed to decode response: zlib_decode(): data error  Retrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info Downloading http://packagist.org/p/provider-2015%245eb5546eae20b24d9d7952a55183a90ee45ca1a1be5c5061e9c36c5cb7c55396.json Downloading http://packagist.org/p/provider-2015%245eb5546eae20b24d9d7952a55183a90ee45ca1a1be5c5061e9c36c5cb7c55396.json Downloading http://packagist.org/p/provider-2015%245eb5546eae20b24d9d7952a55183a90ee45ca1a1be5c5061e9c36c5cb7c55396.json Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2015.json from cache  Your configuration does not allow connection to http://packagist.org. See https://getcomposer.org/doc/06-config.md#secure-http for details.  http://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2016.json from cache Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2017-01.json from cache Reading /home/me/.composer/cache/repo/https---packagist.org/p-provider-2017-04.json from cache Downloading http://packagist.org/p/provider-2017-07%24f8660d0af3680014c46ac2b77b594798f0902078e12d015457257c79beb4390a.json Downloading http://packagist.org/p/provider-2017-07%24f8660d0af3680014c46ac2b77b594798f0902078e12d015457257c79beb4390a.json Downloading http://packagist.org/p/provider-2017-07%24f8660d0af3680014c46ac2b77b594798f0902078e12d015457257c79beb4390a.json   [Composer\Downloader\TransportException]  Your configuration does not allow connection to http://packagist.org. See https://getcomposer.org/doc/06-config.md#secure-http for details.    Exception trace: () at /usr/share/php/Composer/Util/RemoteFilesystem.php:271 Composer\Util\RemoteFilesystem->get() at /usr/share/php/Composer/Util/RemoteFilesystem.php:99 Composer\Util\RemoteFilesystem->getContents() at /usr/share/php/Composer/Repository/ComposerRepository.php:628 Composer\Repository\ComposerRepository->fetchFile() at /usr/share/php/Composer/Repository/ComposerRepository.php:541 Composer\Repository\ComposerRepository->loadProviderListings() at /usr/share/php/Composer/Repository/ComposerRepository.php:283 Composer\Repository\ComposerRepository->whatProvides() at /usr/share/php/Composer/DependencyResolver/Pool.php:199 Composer\DependencyResolver\Pool->computeWhatProvides() at /usr/share/php/Composer/DependencyResolver/Pool.php:188 Composer\DependencyResolver\Pool->whatProvides() at /usr/share/php/Composer/Installer.php:842 Composer\Installer->processDevPackages() at /usr/share/php/Composer/Installer.php:492 Composer\Installer->doInstall() at /usr/share/php/Composer/Installer.php:228 Composer\Installer->run() at /usr/share/php/Composer/Command/UpdateCommand.php:173 Composer\Command\UpdateCommand->execute() at /usr/share/php/Symfony/Component/Console/Command/Command.php:256 Symfony\Component\Console\Command\Command->run() at /usr/share/php/Symfony/Component/Console/Application.php:841 Symfony\Component\Console\Application->doRunCommand() at /usr/share/php/Symfony/Component/Console/Application.php:189 Symfony\Component\Console\Application->doRun() at /usr/share/php/Composer/Console/Application.php:166 Composer\Console\Application->doRun() at /usr/share/php/Symfony/Component/Console/Application.php:120 Symfony\Component\Console\Application->run() at /usr/share/php/Composer/Console/Application.php:99 Composer\Console\Application->run() at /usr/bin/composer:44  update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock] [--no-plugins] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--with-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [-i|--interactive] [--root-reqs] [--] [<packages>]... 

Ich würde mich sehr über jeden Rat freuen, danke