Earlier quoted context omitted.
It depends on the type of support. I'd expect a place such as the city hall to be somewhat low tech, regarding user sophistication levels. And in such an environment most of the support requests are the "where did the button go?" type. A switch to Linux has a good chance to increase these types of requests, at least in the near term.
Users should not be fiddling with the parts of the environment that change between Windows and Linux. Users should not be sticking USB sticks, setting up printers and so on. They should run the programs they are supposed to run in order to work.
One of my big issues with the Linux Desktop community is this attitude that they understand your workflow better than you do. You ask how to do something and you get variations of "don't do that".