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.