Manual installation incompatible

[Karl Berry]

    Unfortunately vanilla TeX Live has no biber
    with linux-armhf and linux-aarch64.

Agreed, although it's not up to "TeX Live". The biber binary is not
(cannot be) built as part of TL. The biber maintainer provides whatever
binaries that volunteers are willing to build (not a trivial task), and
I copy whatever is built upstream into TL.

Any aarch/armhf/other person interested in helping with building biber
should contact the biber maintainer (Phil Kime). I think it's currently
developed on github, https://github.com/plk/biber. --best, karl.