I just updated cordova + ionic in my app, after that i installed successfully Android-SDK v22 via Android SDK manager.
But after the running command:
I have been having the same problem in windows. It appeared that when I was running the SDK Manager you have to select "Run as Administrator" otherwise it denies permission to install certain files, on of them being "ANDROID-22"
Here is the the link I found to resolve this issue: android sdk manger not updating