When upgrading to version 15 from 14, there was an issue. None of my data was
transferred. To fix this issue I swapped to the postgres user who is a
superuser on the PostgreSQL databases.
Then to preform the migration I ran:
-- to do this without swapping user you can use the flag -U
pg_dumpall > sqldump
then when I had the sqldump file, the following command was run from the command line to get use the sqldump file to recover the previous data
psql -f sqldump