I think you can use -o '-D /etc/postgresql/9.5/main' -O '-D /etc/postgresql/13/main' to avoid making the symlink to postgresql.conf. This should also make it ea

I think you can use -o '-D /etc/postgresql/9.5/main' -O '-D /etc/postgresql/13/main' to avoid making the symlink to postgresql.conf. This should also make it easier if postgres.conf tries to includes files from a conf.d subdirectory.