Defect zip folder after download

[SomeStrangeName]

Steps to reproduce

1. Mark a folder in the Web Frontend and download as ZIP
2. ZIP will be downloaded
3. (under Linux) I can't open the ZIP and got an error about unable to decode (null)

Expected behaviour

I would expect to unzipp the folder :)

Actual behaviour

An error message happens

Server configuration

Operating system: Linux Debian Stretch

Web server: Apache

Database: MariaDB

PHP version: PHP 7.0.27-0+deb9u1 (cli) (built: Jan 5 2018 13:51:52) ( NTS )

Nextcloud version: 13.0.0

Updated from an older Nextcloud/ownCloud or fresh install: From former 12.0.0.5 but there I got the same issue

Where did you install Nextcloud from: Original tar with auto Upgrade from older versions

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

root@backup:/var/www/nextcloud# sudo -u www-data php occ app:list
Enabled:
  - activity: 2.6.1
  - bruteforcesettings: 1.0.3
  - calendar: 1.6.1
  - comments: 1.3.0
  - contacts: 2.1.2
  - dav: 1.4.6
  - federatedfilesharing: 1.3.1
  - federation: 1.3.0
  - files: 1.8.0
  - files_antivirus: 1.2.0
  - files_pdfviewer: 1.2.0
  - files_sharing: 1.5.0
  - files_texteditor: 2.5.1
  - files_trashbin: 1.3.0
  - files_versions: 1.6.0
  - firstrunwizard: 2.2.1
  - gallery: 18.0.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.1.0
  - nextcloud_announcements: 1.2.0
  - notifications: 2.1.2
  - oauth2: 1.1.0
  - password_policy: 1.3.0
  - provisioning_api: 1.3.0
  - serverinfo: 1.3.0
  - sharebymail: 1.3.0
  - systemtags: 1.3.0
  - tasks: 0.9.6
  - theming: 1.4.1
  - twofactor_backupcodes: 1.2.3
  - updatenotification: 1.3.0
  - workflowengine: 1.3.0
Disabled:
  - admin_audit
  - encryption
  - files_external
  - files_videoplayer
  - spreed
  - survey_client
  - user_external
  - user_ldap

Nextcloud configuration:

Config report

{
    "system": {
        "updatechecker": false,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
           "***REMOVED SENSITIVE VALUE***",
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",,
        "dbtype": "mysql",
        "version": "13.0.0.14",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "loglevel": 2,
        "maintenance": false,
        "appstore.experimental.enabled": true,
        "theme": "",
        "mail_smtpmode": "sendmail",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "updater.release.channel": "stable",
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

LDAP configuration (delete this part if not used)

LDAP config

Client configuration

Browser: Firefox

Operating system: Linux Debian

Logs

Web server error log

Web server error log

Nextcloud log (data/nextcloud.log)

Nextcloud log

Insert your Nextcloud log here

Browser log

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

I found similar issues but they are already closed:

• Shared folder download issues #3613
• CRC error with zip files downloaded from web UI #2352
  But could not see a solution there.

I also tested with a complete fresh installation (similar environment but different machine) and got the same issue. Downloaded file has some size that could fit to the content but the file can't be opened.

Could it be that there is a dependency to a PHP (or other library) that could be missing?
Any idea where to look for further information?

[SomeStrangeName]

Can be closed seems to be an issue with the local ZIP program and/or Gnome.