As above, so below. If you installed cpan via a deb then it's ubuntu's problem and you should report it to them as a bug. If you installed it from source then it's up to you to reinstall it now.

cpan on the terminal does not work

"does not work" is as useful to a developer as "I'm ill" is to a medic. Be specific.

In reply to Re^3: Segmentation fault (core dumped) by hippo
in thread Segmentation fault (core dumped) by v15

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