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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: 18.3.0
Operating system and version: Debian 10 on ROCK64, 4.4.192-rockchip64
Apache or nginx version: Apache/2.4.38 (Debian)
PHP version: 7.3.11-1~deb10u1
The issue you are facing:
The sharing symbols are missing so no file sharing is possible
Is this the first time you’ve seen this error?: Y
Steps to replicate it:
- Upgrade from ncp 1.20.0 to ncp 1.24.0
- Upgrade from nc 17.0.2 to 18.0.3
- System seams to run without problems, but sharing symbols are missing
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
Error internet_connection_check GuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: www.nextcloud.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)
2020-04-03T15:40:28+0200
Error internet_connection_check GuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: www.nextcloud.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)
2020-04-03T15:37:58+0200
Fatal webdav Sabre\DAV\Exception\BadRequest: Expected filesize of 2074568 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 622592 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.
2020-04-03T12:41:35+0200
Fatal webdav Sabre\DAV\Exception\BadRequest: Expected filesize of 1972225 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 245760 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.
2020-04-03T12:41:35+0200
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 1972225 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 245760 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.
2020-04-03T12:41:35+0200
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 2074568 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 622592 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.
2020-04-03T12:41:35+0
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
Server configuration detail
Operating system: Linux 4.4.192-rockchip64 #1 SMP Tue Oct 8 18:39:24 CEST 2019 aarch64
Webserver: Apache (fpm-fcgi)
Database: mysql 10.3.22
PHP version: 7.3.11-1~deb10u1
Modules loaded: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, session, sodium, standard, cgi-fcgi, mysqlnd, PDO, xml, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, igbinary, intl, json, ldap, exif, mysqli, pdo_mysql, Phar, posix, readline, redis, shmop, SimpleXML, smbclient, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, libsmbclient, Zend OPcache
Nextcloud version: 18.0.3 - 18.0.3.0
Updated from an older Nextcloud/ownCloud or fresh install:
Where did you install Nextcloud from: unknown
<details><summary>Signing status</summary>
Array ( )
</details>
<details><summary>List of activated apps</summary>
Enabled:
- accessibility: 1.4.0
- activity: 2.11.0
- calendar: 2.0.2
- cloud_federation_api: 1.1.0
- contacts: 3.2.0
- dav: 1.14.0
- federatedfilesharing: 1.8.0
- federation: 1.8.0
- files: 1.13.1
- files_pdfviewer: 1.7.0
- files_rightclick: 0.15.2
- files_trashbin: 1.8.0
- files_versions: 1.11.0
- firstrunwizard: 2.7.0
- logreader: 2.3.0
- lookup_server_connector: 1.6.0
- nextcloud_announcements: 1.7.0
- nextcloudpi: 0.0.1
- oauth2: 1.6.0
- password_policy: 1.8.0
- photos: 1.0.0
- previewgenerator: 2.2.0
- provisioning_api: 1.8.0
- settings: 1.0.0
- support: 1.1.0
- systemtags: 1.8.0
- tasks: 0.12.1
- text: 2.0.0
- twofactor_backupcodes: 1.7.0
- updatenotification: 1.8.0
- viewer: 1.2.0
- workflowengine: 2.0.0
Disabled:
- admin_audit
- comments
- encryption
- files_external
- files_sharing
- files_texteditor
- files_videoplayer
- gallery
- news
- notes
- notifications
- previewgenerator.orig
- privacy
- recommendations
- serverinfo
- sharebymail
- survey_client
- theming
- user_ldap
</details>
<details><summary>Configuration (config/config.php)</summary>
{
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": {
"0": "localhost",
"11": "2003:db:1707:9c01:721f:2f83:f3d4:b54",
"1": "192.168.115.110",
"5": "nextcloudpi.local",
"7": "nextcloudpi",
"8": "nextcloudpi.lan",
"4": "cloud.cc-steinatal.de"
},
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "18.0.3.0",
"overwrite.cli.url": "https:\/\/cloud.cc-steinatal.de\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"memcache.local": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"timeout": 0,
"password": "***REMOVED SENSITIVE VALUE***"
},
"tempdirectory": "\/media\/cloud-data\/ncdata\/tmp",
"mail_smtpmode": "smtp",
"mail_smtpauthtype": "LOGIN",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"jpeg_quality": "60",
"overwriteprotocol": "https",
"maintenance": false,
"loglevel": "2",
"logfile": "\/media\/cloud-data\/ncdata\/nextcloud.log",
"mail_sendmailmode": "smtp",
"mail_smtpsecure": "tls",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "587",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"log_type": "file",
"data-fingerprint": "e0f825a16d5c3a1bdb31252a60c57073",
"theme": ""
}
</details>
External storages: files_external is disabled
Encryption: no
User-backends:
OC\User\Database
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE