"Duale Ausbildung" has nothing to do with universities, if you go that route you spend up to four years working at (on average) well below 1000€ while attending a government school that teaches at a rather low level. The government has to subsidize the income of those people and the employer, in some cases.
https://www.azubiyo.de/gehalt/
Worse, if you don't buy into the "dual education" thing, you can't get most of these jobs. We're not talking about great jobs either, it's most jobs that don't require university education. A lot of that is stuff you could be trained for on-the-job in six months or less.
Don't trust German unemployment statistics, it's basically the government paying at every end to have people employed at all costs and often at very low pay.
Also, don't buy into the German educational model, it's one of the most discriminatory systems in the world, even though it is "free" on paper, it's all about weeding out people at a young age so they're not allowed to attend the "free" university. We have parents suing the teachers of ten-year-olds for the grades they give, because of the impact it can have on their careers.
http://www.focus.de/familie/rechte/das-kind-aufs-gymnasium-k...
https://www.opensocietyfoundations.org/voices/hard-look-disc...