[ubuntu] Cannot "apt-get install" in ubuntu 12.04

Hi,
apt get is complete not working for me in ubuntu 12.04
i get the error messenger
error al procesar /var/cache/apt/archives/autogen_1%3a5.12-0.1ubuntu1_i386.deb (--unpack)

I tried with apt-get clean, autoclean, apt-get -f,...

but anything woorks, the problem is independent of what i try to install:confused::confused:
Could somebody help me?
Thanks a lot