Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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, 20.0.5): 27.1.4
Operating system and version (eg, Ubuntu 20.04): Raspberry Pi OS
Apache or nginx version (eg, Apache 2.4.25): nginx 1.14.2
PHP version (eg, 7.4): 8.2.13
The issue you are facing:
Can’t install or update apps.
OCP\Http\Client\LocalServerException: No DNS record found for github.com in nextcloud.log and
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- No idea what introduced it, no idea how to replicate it
The output of your Nextcloud log in Admin > Logging:
OCP\Http\Client\LocalServerException: No DNS record found for github.com
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE
Server which runs nextcloud is completely fine, so is the DNS:
nslookup github.com
Non-authoritative answer:
Name: github.com
Address: 140.82.121.3
Restarted PHP and nginx, made no difference. Updated plenty of other apps today already.