Running the graphical 4.14.0 tl-setup on SLES12 (which doesn't have python3-ldap), when the "Python Dependency" step fails due to python3-ldap not being available the "Forward" button is greyed out even though the text states:
> The configuration process will continue but some parts of THinLinc might not work correctly.
This issue is easily worked around by clicking "Back" and then unchecking "Automatically install the necessary packages".
The expected behavior here would be to allow the user to press "Forward" just like text-mode tl-setup does it.
*** This bug has been marked as a duplicate of bug 5402 ***