En general significa lo mismo que generalmente. Es correcto traducir "in general" como "generalmente".
It was accepted in another excercise as a translation for "in general", I dunno why it's not accepted here :-\
Everything has to be thought of and typed into the Duolingo database. Sometines things which should be included get left out. If you report something which you are sure should be included it will help out all concerned.
Still unaccepted March 28 2016. I'll try reporting.
And still not three months later. New report!
This seemed too easy.. i had to doublecheck to make sure i had the right answer..