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To activate source maps for the Angular Universal server, follow the below steps:

1. Install the dev dependencies using the npm command:

npm i --save-dev source-map-support

1. Add the below line of code at the top of the server.ts file:

require('source-map-support').install();

1. Compile the server.ts file with the --sourceMap flag using the tsc command:

tsc server.ts --sourceMap

1. Start the server by running the compiled JavaScript file:

node dist/server.js

The source maps should now be active for the Angular Universal server. Any errors or logs will now show the exact location of the source file where the error occurred.