Read the article. The Munich transition troubles have little to do with Linux, and a lot to do with the fact that they are having trouble dealing with the rest of the Windows-using world. They've got software that they need to port, and subcontractors that they have to be compatible with.
Where did you see that?? I went thru it twice and all I saw in the article about the Munich troubles was a reference to unspecified news reports:
"Munich's Linux switchover is proving more costly and complex than anticipated, according to news reports out of Germany."