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Adding a delay before starting the services (except for the roscore) solved the problem. roslaunch tries to get the run id from an existing ros master and if it can't get it, it creates a one of its own.Hence the conflict. Seems like the problem was a timing issue. The problem occurred when I was using a mechanical hard drive. The services work fine without using such delays, on a system with similar hardware but with a SSD.

(I have added ExecStartPre=/bin/sleep 10 to the services to get them to work)