Biblatex styles

[Rich Shepard]

One reason the document has no bibliography is that biber cannot find the
authoryear style presented in the Settings -> Bibliography style list:
Package biblatex Info: Trying to load biblatex default data model...
Package biblatex Info: ... file 'blx-dm.def' found.
(/usr/share/texmf-dist/tex/latex/biblatex/blx-dm.def
File: blx-dm.def 2019/12/01 v3.14 biblatex localization (PK/MW)
)
Package biblatex Info: Trying to load biblatex style data model...
Package biblatex Info: ... file 'authoryear.dbx' not found.
Package biblatex Info: Trying to load biblatex custom data model...
Package biblatex Info: ... file 'biblatex-dm.cfg' not found.

Here, /usr/share/texmf-dist/tex/latex/ has several biblatex subdirectories.
Is there a source where I can learn the diffences among them? I've tried a
couple of authoryear-* selections from Settings -> Bibliography Citation and
Bibliography Styles but none I've tried create a bibliography in the
document.

Help's needed!

Rich