当我安装 Ubuntu 13.10 更新时，我没有得到上部栏，我遇到了 gnome-panel 的问题。
(gnome-panel:6959): Gtk-CRITICAL **: gtk_accelerator_parse_with_keycode: assertion 'accelerator != NULL' failed
** (gnome-panel:6959): WARNING **: Unable to parse mouse modifier '(null)'
(gnome-panel:6959): Gtk-CRITICAL **: gtk_accelerator_parse_with_keycode: assertion 'accelerator != NULL' failed
** (gnome-panel:6959): WARNING **: Unable to parse mouse modifier '(null)'
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug
我对计算机一无所知，我该怎么办？