I reproduced similar behavior on eoan with the same steps.
Here's the warnings that displayed during the install on eoan:
adduser: Warning: The home directory `/var/lib/backuppc' does not belong to the user you are currently creating.
...
dpkg-statoverride: warning: deprecated --force option; use --force-all instead
...
To activate the new configuration, you need to run:
systemctl restart apache2
Your MPM seems to be threaded. Selecting cgid instead of cgi.
Enabling module cgid.
I did not do the `a2disconf serve-cgi-bin` step, only `systemctl restart apache2`, it came up ok in lynx.
I reproduced similar behavior on eoan with the same steps.
Here's the warnings that displayed during the install on eoan:
adduser: Warning: The home directory `/var/lib/backuppc' does not belong to the user you are currently creating. statoverride: warning: deprecated --force option; use --force-all instead
...
dpkg-
...
To activate the new configuration, you need to run:
systemctl restart apache2
Your MPM seems to be threaded. Selecting cgid instead of cgi.
Enabling module cgid.
I did not do the `a2disconf serve-cgi-bin` step, only `systemctl restart apache2`, it came up ok in lynx.