Gnome desktop appears instead of unity [closed]

Question

One day I had broken interface of nautilus (just because, without a reason). I uninstalled nautilus and by the way, that screwed unity desktop. Now gnome desktop appears when I boot, even though unity is suposed to be default. Also, at the users login screen, the options of unity disappeared.

I can get to unity by "unity --reset", but the terminal gets blocked with the following text, and when I close the terminal "interrupting" the process, unity is back (the terminal text is as showed below). And then spontaneously, gnome is working wrong, or making mistakes so I have to reset, or unity is suddenly gone... A mess. I have tried several solutions from this web, still didn't work.

I am quite newcomer, and moreover I can't format the computer due to work reasons. Someone could have any idea what is happening? Thanks a lot!!!

neuro2@neuro666:~$ unity --reset
WARNING: Unity currently default profile, so switching to metacity while resetting the values

(metacity:1984): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,
unity-panel-service: proceso no encontrado
Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...yes
[LOG]: Moving Internal Files
[LOG]: Copying subdirectory from /home/neuro2/.compiz/session to /home/neuro2/.compiz-1/session
[LOG]: Copied file /home/neuro2/.compiz/session/101dad7af8ab068411134312229236030200000013650097 to /home/neuro2/.compiz-1/session/101dad7af8ab068411134312229236030200000013650097
[LOG]: Successfully moved internal files
Backend     : gconf
Integration : true
Profile     : unity
Adding plugins
Skipping upgrade com.canonical.unity.unity.01.upgrade
Skipping upgrade com.canonical.unity.unity.02.upgrade
Initializing core options...done
Initializing bailer options...done
Initializing detection options...done
Initializing composite options...done
Initializing opengl options...done
Initializing decor options...done
Initializing mousepoll options...done
Initializing vpswitch options...done
Initializing animation options...done
Initializing snap options...done
compiz (expo) - Warn: failed to bind image to texture
Initializing expo options...done
Initializing move options...done
Initializing place options...done
Initializing grid options...done
Initializing gnomecompat options...done
Initializing wall options...done
Initializing ezoom options...done
Initializing workarounds options...done
Initializing resize options...done
Initializing fade options...done
Initializing unitymtgrabhandles options...done
Initializing scale options...done
Initializing session options...done

Screen geometry changed:
   0x0x1920x1080

unity-panel-service: proceso no encontrado
Initializing unityshell options...done
compiz (core) - Warn: no exact match for ConfigureNotify on 0x2c00090!
compiz (core) - Warn: expected the following changes:
compiz (core) - Warn: sibling: 0x43eeb5
compiz (core) - Warn: instead got:
compiz (core) - Warn: x: 0
compiz (core) - Warn: y: 0
compiz (core) - Warn: width: 1920
compiz (core) - Warn: height: 1080
compiz (core) - Warn: above: 0
compiz (core) - Warn: this should never happen. you should probably file a bug about this.
Starting unity-window-decorator

(unity-window-decorator:2013): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,
DEBUG 2012-07-24 13:15:07 glib <unknown>:0 Setting to primary screen rect: x=0 y=0 w=1920 h=1080
Initializing annotate options...done
Initializing blur options...done
Initializing clone options...done
Initializing colorfilter options...done
Initializing commands options...done
Initializing cube options...done
Initializing debugspew options...done
Initializing imgjpeg options...done
Initializing kdecompat options...done
Initializing mag options...done
Initializing neg options...done
Initializing obs options...done
Initializing opacify options...done
Initializing put options...done
Initializing resizeinfo options...done
Initializing ring options...done
Initializing rotate options...done
Initializing scaleaddon options...done
Initializing screenshot options...done
Initializing shift options...done
Initializing staticswitcher options...done
Initializing switcher options...done
Initializing thumbnail options...done
Initializing water options...done
Initializing winrules options...done
Initializing wobbly options...done
Initializing zoom options...done
Setting Update "main_menu_key"
Setting Update "run_key"