[Koha-devel] Koha does not work after upgrade Ubuntu 18.04 LTS

[Sven Halm]

Hello everybody! 

I have a big problem with my Koha installation for the small library in my primary school. After an update it does not run any more. With my technical experience I am now at the end and hope you can help me. I hope I got the right mailing list. 

What is used? 
Operating System: Ubuntu Server 18.04 LTS 
Koha: 18.05.01 stable 
OPAC: https://lesehoehle.foerderverein-hellwegschule.de 

What's the matter? 
Every few weeks I upgrade Ubuntu and Koha, if something is pending. I recorded the last upgrade yesterday, but since then I can't use Koha anymore. 

When calling the website I get the following error message: 

The proxy server received an invalid response from an upstream server. 
The proxy server could not handle the request GET /index.html. 
Reason: Error reading from remote server 

A matching error message seems to be in the Plack-error log: 

Error while loading /etc/koha/plack.psgi: Can't load application from file "/usr/share/koha/api/v1/app.pl": [JSON::Validator] GET http://json-schema.org/draft-04/schema == Connection refused at /usr/share/perl5/JSON/Validator.pm line 274. 
Compilation failed in require at (eval 1524) line 1. 
Child process 15572 exited with status 111 


Can you help me? 

Thank you and many greetings 
Sven 
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