Perlbrew on Ionos Debian VPS
I recently set up an Ionos VPS with Debian Trixie. This is the least expensive VPS I've been able to find (at £1 + VAT per month) other than the 'free' offerings from Google and Oracle.
Perlbrew would not install, giving errors about being unable to find Cwd.pm (and, once I'd corrected that), Exporter.pm and a slew of other things.
It turns out that the basic Debian install only includes perl-base which lacks fundamentals, like those two, and cpan.
The solution is straightforward (as it always if after you've found the answer). Install the full system perl, using sudo apt install perl and then install perlbrew in the usual way.