Gracias por responder, perdon instale xfce como entorno, cuando ingreso elcomando que me dijiste me muestralo siguientes:
ii xorg 1:7.7+3~deb7u1 i386 X.Org X Window System
ii xorg-docs-core 1:1.6-1 all Core documentation for the X.org X Window System
ii xserver-xorg 1:7.7+3~deb7u1 i386 X.Org X server
ii xserver-xorg-core 2:1.12.4-6+deb7u2 i386 Xorg X server - core server
ii xserver-xorg-input-all 1:7.7+3~deb7u1 i386 X.Org X server -- input driver metapackage
ii xserver-xorg-input-evdev 1:2.7.0-1+b1 i386 X.Org X server -- evdev input driver
ii xserver-xorg-input-mouse 1:1.7.2-3 i386 X.Org X server -- mouse input driver
ii xserver-xorg-input-synaptics 1.6.2-2 i386 Synaptics TouchPad driver for X.Org server
ii xserver-xorg-input-vmmouse 1:12.9.0-1 i386 X.Org X server -- VMMouse input driver to use with VMWare
ii xserver-xorg-input-wacom 0.15.0+20120515-2 i386 X.Org X server -- Wacom input driver
ii xserver-xorg-video-all 1:7.7+3~deb7u1 i386 X.Org X server -- output driver metapackage
ii xserver-xorg-video-apm 1:1.2.3-3 i386 X.Org X server -- APM display driver
ii xserver-xorg-video-ark 1:0.7.4-1+b1 i386 X.Org X server -- ark display driver
ii xserver-xorg-video-ati 1:6.14.4-8 i386 X.Org X server -- AMD/ATI display driver wrapper
ii xserver-xorg-video-chips 1:1.2.4-2 i386 X.Org X server -- Chips display driver
ii xserver-xorg-video-cirrus 1:1.4.0-2 i386 X.Org X server -- Cirrus display driver
ii xserver-xorg-video-fbdev 1:0.4.2-4+b3 i386 X.Org X server -- fbdev display driver
ii xserver-xorg-video-geode 2.11.13-3 i386 X.Org X server -- Geode GX2/LX display driver
ii xserver-xorg-video-i128 1:1.3.5-1+b1 i386 X.Org X server -- i128 display driver
ii xserver-xorg-video-i740 1:1.3.2-4+b3 i386 X.Org X server -- i740 display driver
ii xserver-xorg-video-intel 2:2.19.0-6 i386 X.Org X server -- Intel i8xx, i9xx display driver
ii xserver-xorg-video-mach64 6.9.1-2 i386 X.Org X server -- ATI Mach64 display driver
ii xserver-xorg-video-mga 1:1.5.0-3 i386 X.Org X server -- MGA display driver
ii xserver-xorg-video-neomagic 1:1.2.6-1 i386 X.Org X server -- Neomagic display driver
ii xserver-xorg-video-nouveau 1:1.0.1-5 i386 X.Org X server -- Nouveau display driver
ii xserver-xorg-video-openchrome 1:0.2.906-2+deb7u1 i386 X.Org X server -- VIA display driver
ii xserver-xorg-video-r128 6.8.2-1 i386 X.Org X server -- ATI r128 display driver
ii xserver-xorg-video-radeon 1:6.14.4-8 i386 X.Org X server -- AMD/ATI Radeon display driver
ii xserver-xorg-video-rendition 1:4.2.4-3 i386 X.Org X server -- Rendition display driver
ii xserver-xorg-video-s3 1:0.6.3-5 i386 X.Org X server -- legacy S3 display driver
ii xserver-xorg-video-s3virge 1:1.10.4-5 i386 X.Org X server -- S3 ViRGE display driver
ii xserver-xorg-video-savage 1:2.3.4-1 i386 X.Org X server -- Savage display driver
ii xserver-xorg-video-siliconmotion 1:1.7.6-1 i386 X.Org X server -- SiliconMotion display driver
ii xserver-xorg-video-sis 1:0.10.4-1 i386 X.Org X server -- SiS display driver
ii xserver-xorg-video-sisusb 1:0.9.4-3 i386 X.Org X server -- SiS USB display driver
ii xserver-xorg-video-tdfx 1:1.4.4-1 i386 X.Org X server -- tdfx display driver
ii xserver-xorg-video-trident 1:1.3.5-1 i386 X.Org X server -- Trident display driver
ii xserver-xorg-video-tseng 1:1.2.4-3 i386 X.Org X server -- Tseng display driver
ii xserver-xorg-video-vesa 1:2.3.1-1+b1 i386 X.Org X server -- VESA display driver
ii xserver-xorg-video-vmware 1:12.0.2-1+b1 i386 X.Org X server -- VMware display driver
ii xserver-xorg-video-voodoo 1:1.2.4-2+b3 i386 X.Org X server -- Voodoo display driver