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CHEESE: ne fonctionne plus

Bonjour,
Cheese ne fonctionne plus chez moi (Ubuntu 14.04 LTS)
Si je fais la commande "cheese" dans un terminal je lis ceci :

jmch@jmch-ordi:~$ cheese
ERROR: Could not load classifier cascade /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml
** Message: cheese-application.vala:291: Error during camera setup: Aucun périphérique détecté
(cheese:3771): cheese-CRITICAL **: cheese_camera_device_get_device_node: assertion 'CHEESE_IS_CAMERA_DEVICE (device)' failed
(cheese:3771): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed
(cheese:3771): GLib-GIO-CRITICAL **: g_settings_schema_key_type_check: assertion 'value != NULL' failed
(cheese:3771): GLib-CRITICAL **: g_variant_get_type_string: assertion 'value != NULL' failed
(cheese:3771): GLib-GIO-CRITICAL **: g_settings_set_value: key 'camera' in 'org.gnome.Cheese' expects type 's', but a GVariant of type '(null)' was given
** (cheese:3771): CRITICAL **: cheese_preferences_dialog_setup_resolutions_for_device: assertion 'device != NULL' failed

Quelqu'un a-t-il une idée ?
Merci d'avance

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Ubuntu 16.04 LTS