Il ne trouve pas Libcurl3, tu as essayé de l'installer via apt-get ?
Peut etre en désinstallant Libcurl4 auparavant...

Sinon quelques pistes glanées sur internet :
https://github.com/atom/github/issues/1680
https://github.com/curl/curl/issues/2433#issuecomment-392661742
https://askubuntu.com/questions/1087576/version-curl-openssl-3-not-found
https://askubuntu.com/questions/1061431/how-to-have-both-libcurl3-and-libcurl4-installed-at-same-time

Aucune réponse ?!

Bonjour,

sur une Debian 10 + apache2 j'avais php-5.6-fpm qui fonctionnait bien et (suite à des manipulations de certbot ?) ne redémarre plus:

[code]ks307144 ~ > journalctl -u php-5.6-fpm
-- Logs begin at Tue 2019-11-19 06:18:01 UTC, end at Fri 2019-11-22 11:17:41 UTC. --
nov. 22 08:52:03 ks307144 systemd[1]: Reloading The PHP 5.6 FastCGI Process Manager.
nov. 22 08:52:03 ks307144 systemd[1]: Reloaded The PHP 5.6 FastCGI Process Manager.
nov. 22 08:52:03 ks307144 systemd[1]: php-5.6-fpm.service: Main process exited, code=exited, status=1/FAILURE
nov. 22 08:52:03 ks307144 systemd[1]: php-5.6-fpm.service: Failed with result 'exit-code'.
nov. 22 08:52:08 ks307144 systemd[1]: php-5.6-fpm.service: Unit cannot be reloaded because it is inactive.
nov. 22 09:05:50 ks307144 systemd[1]: Started The PHP 5.6 FastCGI Process Manager.
nov. 22 09:05:50 ks307144 php-fpm[12109]: /opt/php-5.6/sbin/php-fpm: /usr/lib/x86_64-linux-gnu/libcurl.so.4: version `CURL_OPENSSL_3' not found (required by /opt/php-5.6/sbin/php-fpm)
nov. 22 09:05:50 ks307144 systemd[1]: php-5.6-fpm.service: Main process exited, code=exited, status=1/FAILURE
nov. 22 09:05:50 ks307144 systemd[1]: php-5.6-fpm.service: Failed with result 'exit-code'.
ks307144 ~ > ll /usr/lib/x86_64-linux-gnu/libcurl.so.4
lrwxrwxrwx 1 root root 16 juin 14 18:23 /usr/lib/x86_64-linux-gnu/libcurl.so.4 -> libcurl.so.4.5.0
ks307144 ~ > ll /usr/lib/x86_64-linux-gnu/libcurl.so.4.5.0
-rw-r--r-- 1 root root 588232 juin 14 18:23 /usr/lib/x86_64-linux-gnu/libcurl.so.4.5.0[/code]

Toute suggestion bienvenue