Floor Scraper and some curse words. If put down properly with bonding adhesive, it is not going to be EZ. You can then remvoe the adhesive with a power washer, which will be a very time consuming proposition, but will work with tenacity.
There may be a better solution, but I don't know of any.
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I'd prefure being poked in the eye with a stick then to have to scrape off another glued down carpet. But you have to do what you have to do.
What's the plans on what to put down once it's gone?
Northern Tools sell a pneumatic floor scraper. Sure would save getting all those blisters. Works the same as a hand scraper but the blade moves back and forth doing all the work, not the handle like a hand scraper.