Travis: Reactivate GUI integration tests

Description

In our Travis CI builds, on activating the execution of mvn verify -Pwith-gui-tests including the start of fluxbox etc. the builds fail for all JDKs and have been deactivated for now.

Try to fix it.

Environment

None

Assignee

Adrien Lesur

Reporter

René Krell

Impact

Code optimizations and cleanup - safe for all environments

Components

Sprint

None

Affects versions

Priority

Medium
Configure