"tlmgr" on "Ubuntu 22.04"

[Max Chernoff]

I'm guessing that you missed this instruction in the installation
output:

> Most importantly, add /usr/local/texlive/2022/bin/x86_64-linux
> to your PATH for current and future sessions.

Try running

   echo 'export PATH="/usr/local/texlive/2022/bin/x86_64-linux:$PATH"' >> ~/.profile
   
to prepend the newly-installed TeX Live to your PATH.

-- Max