Error starting shibboleth 3.0.4 on ubuntu 20.04, says we need libssl.so.1.0.0

[Peter Schober]

* Lukas Fredriksson via users <users at shibboleth.net> [2023-06-19 03:51]:
> When running 'systemctl start shibd.service' we get an
> error. Running 'journalctl -xe' shows the message '/usr/sbin/shibd:
> error while loading shared libraries: libssl.so.1.0.0: cannot open
> shared object file: No such file or directory'. I have tried
> reinstalling shibboleth but the same error occurs.

Then your system is somehow broken. (Maybe check your apt sources for
stale entries.)  On a fresh Ubuntu 20.04 LTS system installing
libapache2-mod-shib2 pulls in all dependencies and shibd
starts correctly:

$ ldd /usr/sbin/shibd | fgrep ssl
        libssl.so.1.1 => /usr/lib/x86_64-linux-gnu/libssl.so.1.1 (0x00007f56a7e30000)

$ dpkg -S /usr/lib/x86_64-linux-gnu/libssl.so.1.1
libssl1.1:amd64: /usr/lib/x86_64-linux-gnu/libssl.so.1.1

$ systemctl status shibd 
● shibd.service - Shibboleth Service Provider Daemon
     Loaded: loaded (/lib/systemd/system/shibd.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2023-06-19 09:05:13 UTC; 2min 55s ago
       Docs: man:shibd(8)
             https://wiki.shibboleth.net/confluence/display/SP3/Home
   Main PID: 19286 (shibd)
      Tasks: 5 (limit: 618903)
     Memory: 10.0M
        CPU: 43ms
     CGroup: /system.slice/shibd.service
             └─19286 /usr/sbin/shibd -f -F

Jun 19 09:05:13 ubu20 systemd[1]: Starting Shibboleth Service Provider Daemon...
Jun 19 09:05:13 ubu20 systemd[1]: Started Shibboleth Service Provider Daemon.

-peter