встроенный веб-камера не работает в SONY VAIO (GUVCVIEW показывает ошибку

$ guvcview
GUVCVIEW: version 2.0.5
GUVCVIEW: couldn't open /home/ujjawal/.config/guvcview2/video0 for read: No such file or directory
V4L2_CORE: ERROR opening V4L interface: No such file or directory
GUVCVIEW (1): Guvcview error
     no video device found

(guvcview:9819): Gtk-WARNING **: 19:40:54.940: Theme parsing error: <data>:1:17: not a number

(guvcview:9819): Gtk-WARNING **: 19:40:54.940: Theme parsing error: <data>:1:31: Using Pango syntax for the font: style property is deprecated; please use CSS syntax

(guvcview:9819): Gtk-WARNING **: 19:40:54.940: Theme parsing error: <data>:1:17: not a number

(guvcview:9819): Gtk-WARNING **: 19:40:54.940: Theme parsing error: <data>:1:32: Using Pango syntax for the font: style property is deprecated; please use CSS syntax
Gtk-Message: 19:40:54.957: GtkDialog mapped without a transient parent. This is discouraged.