Below two URl's are given in GitHub and both are giving 404 Error. https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml to https://raw.githubusercontent.com/kubernetes/dashboard/master/aio/deploy/recommended/kubernetes-dashboard.yaml
In Many documentation this broken link is there, correct one is updated in github repo https://github.com/kubernetes/dashboard
try this will work https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml