.NET Framework 2.0 and 3.5 feature install fails on Windows Server 2012

If you have Windows Server 2012 iso file or DVD, you can install .net framework 3.5 on Windows Server 2012:

- You have to insert Windows Server 2012 DVD or ISO to D drive
- Open Add Roles and Features Wizard
- Select .NET Framework 3.5 Features and then click next
- Select Specify an alternate source path link in the Confirm installation selections screen
- Path: D:\Sources\SxS and then click OK
- Finally click install button