Problem installing Gems

Hello.

I’m on a laptop Acer Aspire 5100 64 bits using Ubuntu Linux 6.04 64 bits
When I try to install rubygems 0.9.2, I get the following output at the end:

    [...]
    from /home/felipe/Desktop/rubygems-

0.9.2/./post-install.rb:81:in require' from /home/felipe/Desktop/rubygems-0.9.2/./post-install.rb:81:in install_sources’
from /home/felipe/Desktop/rubygems-0.9.2/./post-install.rb:116:in `try_run_hook’

    from setup.rb:584:in `run_hook'
    from setup.rb:1322:in `exec_task_traverse'
    from setup.rb:1175:in `exec_install'
    from setup.rb:894:in `exec_install'
    from setup.rb:712:in `invoke'
    from setup.rb:681:in `invoke'
    from setup.rb:1359

It seems like it’s no

Sorry, continuing…

It seems like it’s not finding a zlib module, but all zlibs modules are installed here, accordingly to my synaptic.

Has anyone faced the same problem?

Thanks.

Felipe