I have just installed kobo on my ubuntu serserver and I am facing the same error with the missing link

[Kal_Lam]

Welcome to the community, @amegabosco! This post discussed previously should help you solve your issue:

Enketo seems running but deployment gives "link missing" and form preview returns "Server Error (500)"

Thanks @Kal_Lam , as indicated here extra_host should be uncommented for ee, kf and kc in the frontend image docker-compose.frontend.override.yml Now the issue is gone.