Atualizar listas e pacotes de pacotes:
sudo apt-get update
sudo apt-get dist-upgrade
Em seguida, reinstale todo o material relacionado a compiz
com:
sudo apt-get install --reinstall compiz compiz-core compiz-gnome \
compiz-plugins compiz-plugins-default compizconfig-settings-manager \
libcompizconfig0 python-compizconfig
Em seguida, reinstale o material relacionado a ubuntu-desktop
:
sudo apt-get install --reinstall a11y-profile-manager-indicator gir1.2-unity-5.0 \
hud libhud2 libaccount-plugin-1.0-0 \
libunity-action-qt1 libunity-control-center1 libunity-core-6.0-9 libunity-misc4 \
libunity-webapps0 libunity-scopes-json-def-desktop \
libunity-gtk2-parser0 libunity-gtk3-parser0 libunity-protocol-private0 \
qml-module-ubuntu-components qml-module-ubuntu-layouts qml-module-ubuntu-onlineaccounts \
qml-module-ubuntu-performancemetrics qml-module-ubuntu-test qml-module-ubuntu-web \
qtdeclarative5-ubuntu-ui-toolkit-plugin qtdeclarative5-unity-action-plugin \
ubuntu-session ubuntu-ui-toolkit-theme unity unity-accessibility-profiles \
unity-lens-applications unity-lens-files unity-lens-music unity-lens-photos \
unity-lens-video unity-schemas unity-scope-calculator unity-scope-chromiumbookmarks \
unity-scope-colourlovers unity-scope-devhelp unity-scope-firefoxbookmarks \
unity-scope-gdrive unity-scope-home unity-scope-manpages unity-scope-openclipart \
unity-scope-texdoc unity-scope-tomboy unity-scope-video-remote unity-scope-virtualbox \
unity-scope-yelp unity-scope-zotero unity-scopes-master-default unity-scopes-runner \
unity-services unity-webapps-common unity-webapps-qml unity-webapps-service unity-settings-daemon \
libunity-settings-daemon1 unity-control-center unity-control-center-faces \
unity-control-center-signon unity-greeter unity-gtk-module-common unity-gtk3-module
E finalmente:
sudo apt-get install --reinstall ubuntu-desktop