How many packages are there in the debuginfod server

The only way I know of is Terminal:
cd debuginfod
cat symbols (file) May need root privileges.

Not listed in the docs.
https://ubuntu.com/server/docs/service-debuginfod
https://ubuntu.com/server/docs/service-debuginfod-faq

https://wiki.ubuntu.com/Debug%20Symbol%20Packages

But I just follow the command on https://ubuntu.com/server/docs/service-debuginfod
and just write `export DEBUGINFOD_URLS="https://debuginfod.ubuntu.com"` and `set debuginfod enabled on` into the corresponding file.
I am confused about your suggestion, since I can not find the folder :
```
cd debuginfod
cat symbols (file)
```

I was not able to find a list of debug symbols.
You my be able to:
cd /debuginfod
ls
look for debug symbols folder
cat the folder

Built-in debug symbol packages (*-dbg) xserver-xorg-core-dbg
Non-built-in debug symbol packages (*-dbgsym)
libprotobuf-c1-dbg
libprotobuf-c1-dbgsym

There seems to be some misunderstanding.

My interpretation of the debugging processes is the following:

In the past the debug packages had to be downloaded manually from the http://ddebs.ubuntu.com/ server and they are still there.
To make access easier, now there is a debuginfod service to be running on your local machine that cares for download.

I am not using that service, so I do not know where the debug packages are stored locally, I just see from the source that an SQLite3 database is involved.

So the question is - which "debuginfod server" are you talking of?

Yes, I agree with your interpretation of the two ways of debugging. And I know there are ddeb packages which contains the corresponding .debug files.
For some reason I have to try to use the "debuginfod" service, because I may have to do the process in other Linux distros which they dont have the separated debug packages.
I am actually using the "https://debuginfod.ubuntu.com" as "debuginfod server"described in "https://ubuntu.com/server/docs/service-dbuginfod".

Yes, I agree with your interpretation of the two ways of debugging. And I know there are ddeb packages which contains the corresponding .debug files. For some reason I have to try to use the "debuginfod" service, because I may have to do the process in other Linux distros which they dont have the separated debug packages. I am actually using the "https://debuginfod.ubuntu.com" as "debuginfod server"described in "https://ubuntu.com/server/docs/service-dbuginfod".

correct link is https://ubuntu.com/server/docs/service-debuginfod ("e" missing)

The only thing I know is that a link like https://debuginfod.ubuntu.com/buildid/69389d485a9793dbe873f0ea2c93e02efaa9aa3d/debuginfo is working and downloads an ELF file with debug information.

Further search indicates, that the cached data are stored in the directory $HOME/.cache/debuginfod_client (or $XDG_CACHE_HOME/debuginfod_client)

What is now your question?

The debuginfod service is meant to download the debug packages at the moment when you need them. What do you expect by downloading everything what's available but not necessarily needed on your system?