Looks like you're still in the same cpan session in which the Tk installation failed. Exit the cpan session, then do a cpan Tk. I'm sure this is also available via apt-get: apt-get install perl-tk, since you seem to be trying to install to the system perl. See Re: LWP::UserAgent @ Ubuntu 8.04 64-Bit for advice.

In reply to Re: Tk module installation by cpan by marto
in thread Tk module installation by cpan by vinoth.ree

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