Segue o LOG dos erros do Apache:
[Sat Jan 30 16:31:09.120653 2021] [php7:warn] [pid 77072] [client 192.168.0.86:64657] PHP Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, n>
24 [Sat Jan 30 16:31:17.373119 2021] [php7:warn] [pid 77068] [client 192.168.0.86:64663] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/a>
25 [Sat Jan 30 16:31:17.373139 2021] [php7:error] [pid 77068] [client 192.168.0.86:64663] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinve>
26 [Sat Jan 30 16:52:26.911452 2021] [mpm_prefork:notice] [pid 77067] AH00169: caught SIGTERM, shutting down
27 [Sat Jan 30 16:53:03.132399 2021] [mpm_prefork:notice] [pid 933] AH00163: Apache/2.4.41 (Ubuntu) mod_perl/2.0.11 Perl/v5.30.0 configured -- resuming normal operatio>
28 [Sat Jan 30 16:53:03.143460 2021] [core:notice] [pid 933] AH00094: Command line: '/usr/sbin/apache2'
29 [Sat Jan 30 16:53:35.544916 2021] [php7:warn] [pid 941] [client 192.168.0.86:64815] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
30 [Sat Jan 30 16:53:35.544958 2021] [php7:error] [pid 941] [client 192.168.0.86:64815] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
31 [Sat Jan 30 16:53:37.268535 2021] [php7:warn] [pid 942] [client 192.168.0.86:64817] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
32 [Sat Jan 30 16:53:37.268565 2021] [php7:error] [pid 942] [client 192.168.0.86:64817] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
33 [Sat Jan 30 16:53:49.240970 2021] [php7:warn] [pid 940] [client 192.168.0.86:64819] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
34 [Sat Jan 30 16:53:49.241025 2021] [php7:error] [pid 940] [client 192.168.0.86:64819] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
35 [Sat Jan 30 17:00:39.904929 2021] [php7:warn] [pid 943] [client 192.168.0.86:64878] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
36 [Sat Jan 30 17:00:39.904962 2021] [php7:error] [pid 943] [client 192.168.0.86:64878] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
37 [Sat Jan 30 17:03:11.410301 2021] [php7:warn] [pid 941] [client 192.168.0.86:64888] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
38 [Sat Jan 30 17:03:11.410328 2021] [php7:error] [pid 941] [client 192.168.0.86:64888] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
39 [Sat Jan 30 17:03:12.174534 2021] [php7:warn] [pid 942] [client 192.168.0.86:64889] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
40 [Sat Jan 30 17:03:12.174555 2021] [php7:error] [pid 942] [client 192.168.0.86:64889] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
41 [Sat Jan 30 17:16:30.253611 2021] [php7:warn] [pid 940] [client 192.168.0.86:65023] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/aut>
42 [Sat Jan 30 17:16:30.253635 2021] [php7:error] [pid 940] [client 192.168.0.86:65023] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinvent>
43 [Sat Jan 30 17:40:37.081281 2021] [php7:warn] [pid 1116] [client 192.168.0.86:65181] PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, nul>
44 [Sat Jan 30 17:40:37.081331 2021] [php7:warn] [pid 1116] [client 192.168.0.86:65181] PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /u>
45 [Sat Jan 30 17:40:37.081341 2021] [php7:warn] [pid 1116] [client 192.168.0.86:65181] PHP Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, nu>
46 [Sat Jan 30 17:40:39.927034 2021] [php7:warn] [pid 941] [client 192.168.0.86:65183] PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null>
47 [Sat Jan 30 17:40:39.927055 2021] [php7:warn] [pid 941] [client 192.168.0.86:65183] PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /us>
48 [Sat Jan 30 17:40:39.927064 2021] [php7:warn] [pid 941] [client 192.168.0.86:65183] PHP Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, nul>
49 [Sat Jan 30 18:03:15.846555 2021] [php7:warn] [pid 1272] [client 192.168.0.86:65506] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/au>
50 [Sat Jan 30 18:03:15.846588 2021] [php7:error] [pid 1272] [client 192.168.0.86:65506] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinven>
51 [Sat Jan 30 20:49:35.721455 2021] [mpm_prefork:notice] [pid 933] AH00169: caught SIGTERM, shutting down
52 [Sat Jan 30 21:10:49.839494 2021] [mpm_prefork:notice] [pid 964] AH00163: Apache/2.4.41 (Ubuntu) mod_perl/2.0.11 Perl/v5.30.0 configured -- resuming normal operatio>
53 [Sat Jan 30 21:10:49.889420 2021] [core:notice] [pid 964] AH00094: Command line: '/usr/sbin/apache2'
54 [Sat Jan 30 21:12:49.771871 2021] [php7:warn] [pid 981] [client 192.168.0.86:50393] PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null>
55 [Sat Jan 30 21:12:49.771920 2021] [php7:warn] [pid 981] [client 192.168.0.86:50393] PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /us>
56 [Sat Jan 30 21:12:49.771930 2021] [php7:warn] [pid 981] [client 192.168.0.86:50393] PHP Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, nul>
57 [Sat Jan 30 21:12:56.200230 2021] [php7:warn] [pid 1155] [client 192.168.0.86:50400] PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, nul>
58 [Sat Jan 30 21:12:56.200267 2021] [php7:warn] [pid 1155] [client 192.168.0.86:50400] PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /u>
59 [Sat Jan 30 21:12:56.200279 2021] [php7:warn] [pid 1155] [client 192.168.0.86:50400] PHP Warning: mysqli_fetch_object() expects parameter 1 to be mysqli_result, nu>
60 [Sat Jan 30 21:12:59.849360 2021] [php7:warn] [pid 1155] [client 192.168.0.86:50400] PHP Warning: require_once(/usr/share/ocsinventory-reports/ocsreports/vendor/au>
61 [Sat Jan 30 21:12:59.849392 2021] [php7:error] [pid 1155] [client 192.168.0.86:50400] PHP Fatal error: require_once(): Failed opening required '/usr/share/ocsinven>
62
Percebi que essa pasta /usr/share/ocsinventory-reports/ocsreports/vendor/au não existe.
Só existe até ocsreports.
O OCS tem uma pasta de LOGs também, mas está vazia.
Estou pesquisando e se achar uma resposta, postarei aqui.