I suppose it's possible that the version under apt is 1.14 and the version that cpan partially installed was 1.15. What I would do is remove the package from cpan and apt and try reinstalling just the apt version.

After that try

sudo apt-get autoremove && sudo apt-get install libdbd-sybase-perl -y

Basically try to clean up some of the mess.

In reply to Re^3: DBD::Sybase error by edimusrex
in thread DBD::Sybase error by sebastiaopburnay

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