By default on Ubuntu the Collector should be installed in the following path.
/usr/local/SumoCollector
You can remove the Collector manually with the following steps
1.) Stop any Collector process that could still be running on the host by going into the Sumo Logic Collector directory and running the following command.
sudo ./collector stop
2.) Once you confirm there is no Collector processes running on the host you can simply delete the entire SumoCollector directory to remove all the files.
sudo rm -rf /usr/local/SumoCollector
3.) Verify there is no init.d file installed for the Sumo process by checking under the
/etc/init.d directory.
This should be it and the Collector and all files should be removed.