Install of keycloak completely break web interface

[dzidek23]

Did you follow either of the guides:

How-to: Migrate from SimpleSAMLphp to Keycloak

How to: Migrate from simpleSAMLphp to Keycloak Starting with UCS 5.2 the Keycloak app replaces the apps SimpleSAMLphp and OpenID Connect Provider as the default identity providers in UCS. The reason for this change is that Keycloak has many advantages in terms of features, configurability, and maintainability over the alternatives, for example, Keycloak provides OIDC and SAML endpoints in one component. This article describes the migration of the single sign-on authentication from simpleSAMLphp…

or
https://docs.software-univention.de/keycloak-migration/index.html