And now, because the Jessie-based Volumio distro is so woefully out-of-date, the CA Certificates bundle (ca-certificates/oldstable,now 20141019+deb8u4 all [installed]) is increasingly non-functional:
$ wget https://www.lesbonscomptes.com/pages/jf-at-dockes.org.pub
--2020-12-07 22:33:52-- https://www.lesbonscomptes.com/pages/jf-at-dockes.org.pub
Resolving www.lesbonscomptes.com (www.lesbonscomptes.com)... 62.210.16.61
Connecting to www.lesbonscomptes.com (www.lesbonscomptes.com)|62.210.16.61|:443... connected.
GnuTLS: Error in the pull function.
Unable to establish SSL connection.
Yes, I know how to update the bundle manually. But that defeats the purpose of having a package manager (as thoroughly broken as the package manager is under Volumio).