I can't create new blog posts or upload files.

[Catclaw]

Hi!

I recently upgraded my server from Ubuntu 16.04 to 18.04.
I'm running a LAMP-server, with PHP 7.2
Everything works fine besides three things:

1. I can't post any blog posts. (I've checked all settings)
2. I can't upload files, despite doing a chmod 777 to assets directory - I just get an error saying upload failed.
3. I can't see any files in the assets directory in the file-upload browser.

Everything else works just fine, like settings, administration, etc.
I've checked all server settings and they're just as they were on 16.04.

I would really appreciate any help.
The site is: www.spacechain.org

Sincerely yours,
Iman

[Catclaw]

Please help!?

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