Boa noite.
Digitei o comando "sudo apt-get install --reinstall compiz-plugins-default", o pacote foi reinstalado.
Aí resetei o ubuntu e fiz o seguite:
"sudo apt-get update"
depois digitei no terminal:
rafael@Rafael-Rosana:~$ unity
e a resposta segue abaixo.
unity-panel-service: nenhum processo localizado
Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...no
Backend : gconf
Integration : true
Profile : unity
Adding plugins
Initializing core options...done
Initializing composite options...done
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libopengl.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'opengl'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libcompiztoolbox.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'compiztoolbox'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libdecor.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'decor'
Initializing vpswitch options...done
Initializing snap options...done
Initializing mousepoll options...done
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libresize.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'resize'
Initializing place options...done
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libmove.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'move'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libwall.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'wall'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libgrid.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'grid'
Initializing session options...done
Initializing gnomecompat options...done
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libanimation.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'animation'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libfade.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'fade'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libunitymtgrabhandles.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'unitymtgrabhandles'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libworkarounds.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'workarounds'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libscale.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'scale'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libexpo.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'expo'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libezoom.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'ezoom'
compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libunityshell.so' : libGL.so.1: cannot open shared object file: No such file or directory
compiz (core) - Error: Couldn't load plugin 'unityshell'
Setting Update "main_menu_key"
Setting Update "run_key"
nesse ponto a tela piscou duas vezes, as janelas ficaram sem a barra de título ou os botões da barra e não podem mais ser movidos nem com atalhos de teclado.
Eu também estava usando o modo "gnome classic(No effects)" e deṕois disso tudo referente ao gerenciador de janelas sumiu!
fiquei perdidin...
e agora?