manual repository set up for ubuntu 24.04 'noble' fails certificate

I want to install postgreSQL *16*, so I walked through the very good
instructions carefully, but on "sudo apt update" system gave this error:

bern:~$ *sudo apt update*
*E: Conflicting values set for option Signed-By *regarding *source*
https://apt.postgresql.org/pub/repos/*apt**/_*noble-pgdg:
/usr/share/postgresql-common/pgdg/*apt.postgresql.org.asc* *!=*
/usr/share/postgresql-common/pgdg/*apt.postgresql.org.gpg*
E: The list of sources could not be read.

the file created:
/etc/apt/sources.list.d/*pgdg.list:*
deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc]
https://apt.postgresql.org/pub/repos/*apt_noble*-pgdg main

Is that trailing red slash in the error message hinting sys is trying to
read .../apt*/*noble-pgdg even though it does show the space(_) after */*_?
Or is the *gpg* file out of sync w certificate?

*Bernard (Bern) Baillargeon*