Installing Jboss tools in ubunto is aborted

When installing "**Jboss tools 4.24.0 Final**" in Eclipse, the following error message appears: > Warning: You are installing software that contains unsigned content. > The authenticity or validity of this software cannot be established. > Do you want to continue with the installation? By clicking on "**Install anywhere**", the installation is aborted and "**Jboss tools**" is not installed. Does anyone have an idea on the source of this error ? Thanks.