Desempaquetando fglrx (de .../fglrx_2%3a8.780-0ubuntu2_amd64.deb) ...

[Warning] Uninstall : inst_path_default or inst_path_override
 does not exist in /etc/ati.  This suggests that the ATI driver
 is not installed, the ATI driver is only partially installed,
 or the current ATI driver installed is an older version than the
 one this script was designed for.  Both files listed above are
 required for determining where installed files are located.
 To force uninstallation of the driver by guessing where the
 uninstallation files are located, set the FORCE_ATI_UNINSTALL
 environment variable and re-run /usr/share/ati/fglrx-uninstall.sh (this is not recommended).

dpkg: error al procesar /var/cache/apt/archives/fglrx_2%3a8.780-0ubuntu2_amd64.deb (--unpack):
 el subproceso script pre-installation nuevo devolvió el código de salida de error 1
Se encontraron errores al procesar:
 /var/cache/apt/archives/fglrx_2%3a8.780-0ubuntu2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)