Suddenly My Ubuntu 16.04 LTS giving me a issue, I can't open files manger as well as screenshots app. So I dig into the problem and found this temporary solution for file manager. Still searching for permanent solution. Ubuntu is very buggy since and then, not stable any way.
Step 1:
@jpudasaini:~$ nautilus -q
(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
(nautilus:6210): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed
(nautilus:6210): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(nautilus:6210): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Step 2:
jpudasaini@jpudasaini:~$ nautilus
Nautilus-Share-Message: Called "net usershare info" but it failed: Failed to execute child process "net" (No such file or directory)
Step 1:
@jpudasaini:~$ nautilus -q
(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
(nautilus:6210): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed
(nautilus:6210): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(nautilus:6210): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Step 2:
jpudasaini@jpudasaini:~$ nautilus
Nautilus-Share-Message: Called "net usershare info" but it failed: Failed to execute child process "net" (No such file or directory)
New your file manager is ready to used.
HTH
