Generated release notes say that Perl 5.10 is required

Perl 5.10 seems to be from the era pf Debian 5.

Thus the release notes up to the latest 19.11.x say:

Perl 5.10 is required

And for 20.05 this changed a bit

Perl 5.10 is required (5.24 is recommended)

Thought Debian 10 ships Perl 5.28 and Ubuntu 18.04 ships Perl 5.26.