I am hosting Ubuntu mirror both for their releases as well as repo data in a Mumbai datacenter. This mirror is behind CTPL AS132933 with direct connectivity to hundreds of peers of DE-CIX Mumbai and via a mix of IP transits for the rest of the world.
If you are a Ubuntu user in India, you can expect to reach the server within (mostly) 50ms latency and can be accessed over both IPv4 and IPv6. Also, these mirrors are optional HTTPS. They can be accessed with both HTTP & HTTPS. If you have any feedback about these mirrors, just drop me a message!