Невозможно получить доступ к Системным настройкам или установить программное обеспечение после обновления с Ubuntu 14.04 до Ubuntu 16.04

Я недавно обновил Ubuntu 14.04 до Ubuntu 16.04.

Я не могу получить доступ к Системным настройкам и, следовательно, настройкам времени и даты, настройкам Bluetooth и т. Д.

Я попытался установить ubuntu-desktop

, и он дал мне следующие ошибки:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ubuntu-desktop : Depends: checkbox-gui but it is not going to be installed
                  Depends: unity-control-center but it is not going to be installed
                  Recommends: cheese but it is not going to be installed
                  Recommends: gedit but it is not going to be installed
                  Recommends: libreoffice-calc but it is not going to be installed
                  Recommends: libreoffice-gnome but it is not going to be installed
                  Recommends: libreoffice-impress but it is not going to be installed
                  Recommends: libreoffice-math but it is not going to be installed
                  Recommends: libreoffice-ogltrans but it is not going to be installed
                  Recommends: libreoffice-pdfimport but it is not going to be installed
                  Recommends: libreoffice-writer but it is not going to be installed
                  Recommends: rhythmbox but it is not going to be installed
                  Recommends: totem but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Я также попытался установить unity-control-center

и получил эту ошибку:

The following packages have unmet dependencies:
 unity-control-center : Depends: libcheese-gtk25 (>= 3.18.0) but it is not going to be installed
                        Depends: libcheese8 (>= 3.18.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Когда я попытался установить через Synaptic, он выдал эту ошибку:

Could not apply changes!
Fix broken packages first.

Результаты deborphan:

gstreamer0.10-alsa:amd64
libqgispython2.18.4:amd64
libmwaw-0.3-3:amd64
libxp6:amd64
libnetcdf11:amd64
libopenjp2-7:amd64
libqgisgrass6-2.18.7:amd64
libcmis-0.5-5v5:amd64
libqgis-app2.18.11:amd64
libqgispython2.18.7:amd64
libhal1-flash:amd64
linux-signed-generic-lts-xenial:amd64
libgles2-mesa-lts-xenial:amd64
xserver-xorg-input-all-lts-xenial:amd64
libodfgen-0.1-1:amd64
libqgis-app2.18.4:amd64
xserver-xorg-lts-xenial:amd64
libqgisgrass6-2.18.4:amd64
liborcus-0.10-0v5:amd64
libgeos-3.5.0:amd64
libmspub-0.1-1:amd64
libexttextcat-2.0-0:amd64
xserver-xorg-core-lts-xenial:amd64
linux-generic-lts-xenial:amd64
libgl1-mesa-dri-lts-xenial:i386
compiz-plugins-extra:all
libabw-0.1-1v5:amd64
gnomine:all
libqgis-app2.18.7:amd64
libe-book-0.1-1:amd64
libjansson4:amd64
gstreamer0.10-fluendo-mp3:amd64
libprocps3:amd64
libgles1-mesa-lts-xenial:amd64
myspell-en-gb:all
libpagemaker-0.0-0:amd64
linux-generic-lts-wily:amd64
libegl1-mesa-lts-xenial:amd64
libcgal11v5:amd64
libneon27-gnutls:amd64
gstreamer0.10-plugins-bad-multiverse:amd64
libdapclient6v5:amd64
libboost-serialization1.58.0:amd64
bluez-utils:all
libclucene-contribs1v5:amd64
activity-log-manager-control-center:all
libwayland-egl1-mesa-lts-xenial:amd64
grilo-plugins-0.2-base:amd64
libcoin80v5:amd64
libkmlengine1:amd64
libllvm3.4:amd64
libllvm3.4:i386
libqgis-networkanalysis2.18.7:amd64
libproxy1-plugin-gsettings:amd64
libeot0:amd64
gstreamer0.10-plugins-bad:amd64
libgl1-mesa-glx-lts-xenial:i386
libgl1-mesa-glx-lts-xenial:amd64
libapt-inst1.5:amd64
libmythes-1.2-0:amd64
libproxy1-plugin-networkmanager:amd64
libtimezonemap1:amd64
libetonyek-0.1-1:amd64
libarmadillo6:amd64
libxatracker2-lts-xenial:amd64
linux-signed-generic-lts-wily:amd64
libopenthreads20:amd64
lib32z1:amd64
myspell-en-za:all
libwps-0.4-4:amd64
libreadline5:amd64
overlay-scrollbar-gtk2:amd64
libqgisgrass6-2.18.11:amd64
libgnome-bluetooth11:amd64
libxnvctrl0:amd64
libplymouth2:amd64
libmpdec2:amd64
libxine2:amd64
lib32gcc1:amd64
libfreehand-0.1-1:amd64
libqgis-networkanalysis2.18.4:amd64
libdmapsharing-3.0-2:amd64

Также, apt-get update выдает следующие ошибки:

W: The repository 'http://ppa.launchpad.net/alex-wv/pulseaudio-equalizer-ppa/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/kalakris/okular/ubuntu trusty Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/alex-wv/pulseaudio-equalizer-ppa/ubuntu/dists/xenial/main/source/Sources  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/kalakris/okular/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Как я могу исправить эту проблему?