Bonjour à tous,

je souhaiterai mettre à jour ma version de symfony (3.1 à 4.3).
j'ai pour cela essayé de mettre à jour via la commande self-update mais il me donne l'erreur suivante :

yann@yann-laptop:~$ sudo symfony self-update
[sudo] Mot de passe de yann*:
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/dom.so' - /usr/lib/php/20160303/dom.so: undefined symbol: php_libxml_node_free_list in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xmlreader.so' - /usr/lib/php/20160303/xmlreader.so: undefined symbol: dom_node_class_entry in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xsl.so' - /usr/lib/php/20160303/xsl.so: undefined symbol: dom_node_class_entry in Unknown on line 0
// Symfony Installer is already updated to the latest version (1.5.11).
j'ai ensuite tenté de mettre à jour composer : je suis passé de 1.1.1 à 1.8.6 mais il ne veut pas aller plus loin; il reste à 1.8.6.
yann@yann-laptop:~$ composer self-update
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/dom.so' - /usr/lib/php/20160303/dom.so: undefined symbol: php_libxml_node_free_list in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xmlreader.so' - /usr/lib/php/20160303/xmlreader.so: undefined symbol: dom_node_class_entry in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xsl.so' - /usr/lib/php/20160303/xsl.so: undefined symbol: dom_node_class_entry in Unknown on line 0
You are already using composer version 1.8.6 (stable channel).
comment aller plus loin ?

Merci de votre aide