我最近安装了 Ubuntu 20.04LTS，我想更改设置，但我找不到它。所以我安装了“gnome-control-center”，但仍然无法打开它。奇怪的是设置已打开，但我看不到。它位于屏幕后面。设置屏幕对我来说不可见。请参阅屏幕截图：
当我尝试此选项时，终端会详细显示“gnome-control-center -v”，它在终端上显示以下消息：
sami@sami-Inspiron-N5110:~$ gnome-control-center -v
12:28:26.0836 GLib: DEBUG: setenv()/putenv() are not thread-safe and should not be used after threads are created
12:28:26.0855 cc-object-storage: DEBUG: Finished creating D-Bus proxy for CcObjectStorage::dbus-proxy(org.gnome.SettingsDaemon.Color,/org/gnome/SettingsDaemon/Color,org.freedesktop.DBus.Properties)
12:28:26.0855 cc-object-storage: DEBUG: Adding object GDBusProxy (CcObjectStorage::dbus-proxy(org.gnome.SettingsDaemon.Color,/org/gnome/SettingsDaemon/Color,org.freedesktop.DBus.Properties) → 0x7f9fd0009890) to the storage
12:28:26.0855 cc-object-storage: DEBUG: Finished creating D-Bus proxy for CcObjectStorage::dbus-proxy(org.gnome.SettingsDaemon.Color,/org/gnome/SettingsDaemon/Color,org.gnome.SettingsDaemon.Color)
12:28:26.0856 cc-object-storage: DEBUG: Adding object GDBusProxy (CcObjectStorage::dbus-proxy(org.gnome.SettingsDaemon.Color,/org/gnome/SettingsDaemon/Color,org.gnome.SettingsDaemon.Color) → 0x55c6c981aa00) to the storage
12:28:26.0856 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:26.0856 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:26.0857 cc-object-storage: DEBUG: Finished creating D-Bus proxy for CcObjectStorage::dbus-proxy(org.gnome.Shell,/org/gnome/Shell,org.gnome.Shell)
12:28:26.0857 cc-object-storage: DEBUG: Adding object GDBusProxy (CcObjectStorage::dbus-proxy(org.gnome.Shell,/org/gnome/Shell,org.gnome.Shell) → 0x55c6c981aa90) to the storage
12:28:26.0859 diagnostics-cc-panel: DEBUG: ABRT vanished
12:28:26.0859 display-cc-panel: DEBUG: SensorProxy vanished
12:28:26.0859 display-cc-panel: DEBUG: Has no accelerometer
12:28:26.0897 display-cc-panel: DEBUG: Resetting current config!
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.897: watch_fast: "/org/gnome/mutter/" (establishing: 0, active: 0)
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.897: watch_established: "/org/gnome/mutter/" (establishing: 1)
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.898: watch_fast: "/org/gnome/mutter/" (establishing: 0, active: 1)
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.898: unwatch_fast: "/org/gnome/mutter/" (active: 2, establishing: 0)
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.914: watch_fast: "/org/gnome/mutter/" (establishing: 0, active: 1)
(gnome-control-center:7000): dconf-DEBUG: 12:28:26.915: unwatch_fast: "/org/gnome/mutter/" (active: 2, establishing: 0)
12:28:36.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:36.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:46.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:46.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:56.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:28:56.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:06.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:06.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:16.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:16.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:26.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:26.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:36.0698 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:36.0699 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:46.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:46.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:56.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:29:56.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:16.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:16.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:26.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:26.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:36.0690 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:36.0690 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:46.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:46.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:56.0698 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:30:56.0698 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:16.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:16.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:36.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:36.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:46.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:46.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:56.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:31:56.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:06.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:16.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:16.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:36.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:36.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:46.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:46.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:56.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:32:56.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:06.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:06.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:16.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:16.0692 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:26.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:36.0690 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:36.0690 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:46.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:33:46.0697 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:38:50.0336 (null): DEBUG: No extra argument
12:38:56.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:38:56.0689 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:39:06.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:39:06.0693 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:39:16.0695 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
12:39:16.0695 display-cc-panel: DEBUG: setting adjustment -1.000 to -1:-0
(gnome-control-center:7000): dconf-DEBUG: 12:39:23.209: unwatch_fast: "/org/gnome/mutter/" (active: 1, establishing: 0)
(gnome-control-center:7000): dconf-DEBUG: 12:39:23.212: unwatch_fast: "/org/gnome/settings-daemon/plugins/color/" (active: 1, establishing: 0)
(gnome-control-center:7000): dconf-DEBUG: 12:39:23.212: unwatch_fast: "/org/gnome/desktop/interface/" (active: 1, establishing: 0)
(gnome-control-center:7000): dconf-DEBUG: 12:39:23.219: sync
(gnome-control-center:7000): dconf-DEBUG: 12:39:23.222: unwatch_fast: "/org/gnome/control-center/" (active: 1, establishing: 0)
12:39:23.0222 cc-object-storage: DEBUG: Destroying cached objects
有人能在这方面帮助我吗？
谢谢。