We all followed the story about how Munich switched to Linux and then had to switch back after many years. Many of us thought they were doomed to fail because they used an old version of Suse Linux and never upgraded it.
Now we read the Barcelona is switching to Ubuntu and also investing in open source. This could be a winner!
By Made and uploaded by Huhsunqu. - Own work, CC BY-SA 2.5, Link
So I could have only mentioned one source, but I took care to credit the image properly. Yes we need to take care of copyright.