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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 18.0.1
Operating system and version (eg, Ubuntu 17.04): LMDE 3 Cindy
Apache or nginx version (eg, Apache 2.4.25): 2.4.25
PHP version (eg, 7.1): 7.2.28
The issue you are facing: While adding external drives I am unable to select users or groups. The box says Loading Failed.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Try selecting Users or Groups to access external drives
The output of your Nextcloud log in Admin > Logging:
[index] Error: Doctrine\DBAL\Exception\DriverException: An exception occurred while executing 'SELECT `uid`, `displayname` FROM `oc_users` `u` LEFT JOIN `oc_preferences` `p` ON (`userid` = `uid`) AND (`appid` = 'settings') AND (`configkey` = 'email') WHERE (`uid` COLLATE utf8mb4_general_ci LIKE ?) OR (`displayname` COLLATE utf8mb4_general_ci LIKE ?) OR (`configvalue` COLLATE utf8mb4_general_ci LIKE ?) ORDER BY `uid_lower` ASC LIMIT 30' with params ["%%", "%%", "%%"]:
SQLSTATE[42000]: Syntax error or access violation: 1253 COLLATION 'utf8mb4_general_ci' is not valid for CHARACTER SET 'utf8' at <<closure>>
0. /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php line 169
Doctrine\DBAL\Driver\AbstractMySQLDriver->convertException("An exception oc ... '", Doctrine\DBAL\Dr ... ]})
1. /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php line 145
Doctrine\DBAL\DBALException::wrapException(Doctrine\DBAL\Driver\PDOMySql\Driver {}, Doctrine\DBAL\Dr ... ]}, "An exception oc ... '")
2. /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php line 911
Doctrine\DBAL\DBALException::driverExceptionDuringQuery(Doctrine\DBAL\Driver\PDOMySql\Driver {}, Doctrine\DBAL\Dr ... ]}, "SELECT `uid`, ` ... 0", {1: "%%",2: "%%",3: "%%"})
3. /var/www/nextcloud/lib/private/DB/Connection.php line 199
Doctrine\DBAL\Connection->executeQuery("SELECT `uid`, ` ... 0", {1: "%%",2: "%%",3: "%%"}, {1: 2,2: 2,3: 2}, "*** sensitive parameter replaced ***")
4. /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Query/QueryBuilder.php line 200
OC\DB\Connection->executeQuery("SELECT `uid`, ` ... 0", {1: "%%",2: "%%",3: "%%"}, {1: 2,2: 2,3: 2})
5. /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php line 215
Doctrine\DBAL\Query\QueryBuilder->execute()
6. /var/www/nextcloud/lib/private/User/Database.php line 285
OC\DB\QueryBuilder\QueryBuilder->execute()
7. /var/www/nextcloud/lib/private/User/Manager.php line 275
OC\User\Database->getDisplayNames("", 30, 0)
8. /var/www/nextcloud/apps/files_external/ajax/applicable.php line 50
OC\User\Manager->searchDisplayName("", 30, 0)
9. /var/www/nextcloud/lib/private/Route/Route.php line 155
require_once("/var/www/nextcl ... p")
10. <<closure>>
OC\Route\Route->OC\Route\{closure}("*** sensitive parameters replaced ***")
11. /var/www/nextcloud/lib/private/Route/Router.php line 299
call_user_func(Closure {}, {_route: "files_ ... "})
12. /var/www/nextcloud/lib/base.php line 1008
OC\Route\Router->match("/apps/files_external/applicable")
13. /var/www/nextcloud/index.php line 38
OC::handleRequest()
GET /index.php/apps/files_external/applicable?pattern=&limit=30&offset=0&_=1582851635731
from 71.113.130.24 by jeff at 2020-02-28T01:00:40+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocl7nygyhse3',
'passwordsalt' => 'D5xZZu37L/W+9RVop6uLkAGOGGZu1G',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'mydomain.com',
),
'datadirectory' => '/home/data',
'dbtype' => 'mysql',
'version' => '18.0.1.3',
'overwrite.cli.url' => 'https://bmydomain.com',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:5432',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'jeff',
'dbpassword' => 'password',
'installed' => true,
'maintenance' => false,
'mysql.utf8mb4' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'myemail',
'mail_domain' => 'address.com',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '465',
'mail_smtpname' => 'myemail@assress.com',
'mail_smtppassword' => 'password',
'updater.release.channel' => 'stable',
);
The output of your Apache/nginx/system log in /var/log/____:
[Thu Feb 27 00:09:04.291810 2020] [mpm_prefork:notice] [pid 6234] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2u configured -- resuming normal operations
[Thu Feb 27 00:09:04.291854 2020] [core:notice] [pid 6234] AH00094: Command line: '/usr/sbin/apache2'
[Thu Feb 27 19:42:41.876984 2020] [mpm_prefork:notice] [pid 6234] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Thu Feb 27 19:42:42.020110 2020] [mpm_prefork:notice] [pid 6234] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2u configured -- resuming normal operations
[Thu Feb 27 19:42:42.020133 2020] [core:notice] [pid 6234] AH00094: Command line: '/usr/sbin/apache2'
[Thu Feb 27 19:42:42.391296 2020] [mpm_prefork:notice] [pid 6234] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Thu Feb 27 19:42:42.476206 2020] [mpm_prefork:notice] [pid 6234] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2u configured -- resuming normal operations
[Thu Feb 27 19:42:42.476235 2020] [core:notice] [pid 6234] AH00094: Command line: '/usr/sbin/apache2'
[Thu Feb 27 19:55:12.171503 2020] [mpm_prefork:notice] [pid 6234] AH00169: caught SIGTERM, shutting down
[Thu Feb 27 19:55:12.317859 2020] [mpm_prefork:notice] [pid 25781] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2u configured -- resuming normal operations
[Thu Feb 27 19:55:12.317946 2020] [core:notice] [pid 25781] AH00094: Command line: '/usr/sbin/apache2'
