new installation thinks it is 2018

I installed current TexLive afresh on a new HD under Devuan beowulf. The file I’ve been working on has usepackage{siunitx) in preamble, but after with the re-installation when I run latex on it under emacs I get: Error: File `siunitx.sty’ not found. I realized I had not copied the TeX packages from my old disk to the new.

So I ran $ tlmgr –gui and do "Load Default" from the ctan mirror. But get error: "Loading of remote database failed. Error message: Remote repository is newer than local (2018 < 2020)". The problem this is I’m running TeXLive 20200731. Two years ago I did run the 2018 version.

So I proceed to update my database by downloding and unzipping
update-tlmgr-latest.sh. I do have /bin/sh. Here is what I get:

Verifying archive integrity… All good.
Uncompressing TeX Live Manager Updater 100%
./runme.sh: Cannot find TeX Live root using kpsewhich
–var-value=SELFAUTOPARENT.
./runme.sh: (no tlpkg/texlive.tlpdb and/or tlpkg/tlpobj/.)
./runme.sh: Please set your PATH as needed, otherwise it’s hopeless.

I try
$ tlmgr update –self
(running on Debian, switching to user mode!)
tlmgr: Remote repository is newer than local (2018 < 2020)
Cross release updates are only supported with
update-tlmgr-latest(.sh/.exe) –update
Please see https://tug.org/texlive/upgrade.html for details.

The configuration:

(running on Debian, switching to user mode!)
===================== version information =======================
tlmgr revision 49885 (2019-01-31 20:27:00 +0100)
tlmgr using installation: /usr/share/texlive
…
PATH: /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
…
kpsewhich: /usr/bin/kpsewhich
…
TEXCONFIG={{}/home/haines/.texlive2018/texmf-config,/home/haines/…
…
== kpathsea variables from environment only (ok if no output here)

So it seems my TeXLive as 2018. In /home/haines there is no longer any .texlfive directory.
In ~/.profile there is:

PATH=/usr/local/texlive/2020/bin/x86_64-linux:$PATH; export PATH