To install Microsoft SQL 2012 on a Microsoft 2012 core edition, use the /UIMODE switch. This will bring op the old interface.

setup /UIMODE=EnableUIonServerCore

Other samples to install it through the command line (parameters or file) can be found on: https://www.mssqltips.com/sqlservertip/2725/installing-sql-server-2012-on-windows-server-core-part-3/