Problems with CPAN

Hey everyone, I have this problem with cpan I can't resolve. Almost everything I try to do with cpan gives me the following error (sooner or later): 

tux ~ # cpan

There seems to be running another CPAN process (pid 22470).  Contacting...
Other job not responding. Shall I overwrite the lockfile? (Y/N) [y]

cpan shell -- CPAN exploration and modules installation (v1.7601)
ReadLine support enabled

Can't ioctl TIOCGETP: Das Argument ist ungltig
Consider installing Term::ReadKey from CPAN site nearby
        at http://www.perl.com/CPAN
Or use
        perl -MCPAN -e shell
to reach CPAN. Falling back to 'stty'.
        If you do not want to see this warning, set PERL_READLINE_NOWARN
in your environment.
cpan> install Bundle::Cpan
CPAN: Storable loaded ok
Going to read /root/.cpan/sources/authors/01mailrc.txt.gz
Going to read /root/.cpan/sources/modules/02packages.details.txt.gz
Subroutine AUTOLOAD redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Compr
ess/Zlib.pm line 84.
Subroutine isaFilehandle redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/
Compress/Zlib.pm line 106.
Subroutine isaFilename redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Co
mpress/Zlib.pm line 115.
Subroutine gzopen redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Compres
s/Zlib.pm line 122.
Subroutine ParseParameters redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linu
x/Compress/Zlib.pm line 139.
Subroutine deflateInit redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Co
mpress/Zlib.pm line 205.
Subroutine inflateInit redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Co
mpress/Zlib.pm line 217.
Subroutine Compress::Zlib::deflateStream::deflateParams redefined at /usr/lib/pe
rl5/site_perl/5.8.6/i686-linux/Compress/Zlib.pm line 227.
Subroutine compress redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Compr
ess/Zlib.pm line 256.
Subroutine uncompress redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Com
press/Zlib.pm line 287.
Constant subroutine Compress::Zlib::MAGIC1 redefined at /usr/lib/perl5/5.8.7/con
stant.pm line 103.
Constant subroutine Compress::Zlib::MAGIC2 redefined at /usr/lib/perl5/5.8.7/con
stant.pm line 103.
Constant subroutine Compress::Zlib::OSCODE redefined at /usr/lib/perl5/5.8.7/con
stant.pm line 103.
Constant subroutine Compress::Zlib::FTEXT redefined at /usr/lib/perl5/5.8.7/cons
tant.pm line 103.
Constant subroutine Compress::Zlib::FHCRC redefined at /usr/lib/perl5/5.8.7/cons
tant.pm line 103.
Constant subroutine Compress::Zlib::FEXTRA redefined at /usr/lib/perl5/5.8.7/con
stant.pm line 103.
Constant subroutine Compress::Zlib::FNAME redefined at /usr/lib/perl5/5.8.7/cons
tant.pm line 103.
Constant subroutine Compress::Zlib::FCOMMENT redefined at /usr/lib/perl5/5.8.7/c
onstant.pm line 103.
Constant subroutine Compress::Zlib::NULL redefined at /usr/lib/perl5/5.8.7/const
ant.pm line 103.
Constant subroutine Compress::Zlib::RESERVED redefined at /usr/lib/perl5/5.8.7/c
onstant.pm line 103.
Constant subroutine Compress::Zlib::MIN_HDR_SIZE redefined at /usr/lib/perl5/5.8
.7/constant.pm line 103.
Subroutine memGzip redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Compre
ss/Zlib.pm line 326.
Subroutine _removeGzipHeader redefined at /usr/lib/perl5/site_perl/5.8.6/i686-li
nux/Compress/Zlib.pm line 357.
Subroutine memGunzip redefined at /usr/lib/perl5/site_perl/5.8.6/i686-linux/Comp
ress/Zlib.pm line 416.
Speicherzugriffsfehler
tux ~ # 


The same happens when I am trying to install Compress::Zlib, or most of the other modules.

I already re-installed perl, and switched versions, but it doesn't seem to help.

Does anyone know how to fix this problem, please? Any help approciated...