Using version 5.3.95 in Kubuntu Wiley beta, not listed in the versions As said in the summary: the option "Configure Software Sources" doesn't do what is expected, namely open a dialogue that let's the user configure the Software Sources, Reproducible: Always Steps to Reproduce: Klick on More... and go to Advanced... -> Configure Software Sources Actual Results: No configuration dialogue shows up, but it updates the preconfigured sources. So either the wording needs to change or there is indeed a bug and the action to configure is wrongly linked to the action "update"
*** This bug has been marked as a duplicate of bug 351311 ***