The think is that some packages from debian.koha-community.org have code compiled for perl, so they depend on its version. For example "libref-util-perl" installs module in : /usr/lib/x86_64-linux-gnu/perl5/5.20/ But the perl is : Debian 9 : 5.20 Debian 10 : 5.24 Ubuntu 18.04 : 5.22 I was wondering how we can provide a compatiblity in our packages.