Last year I removed an old vinyl layering on concrete and it was glued. Removing the glue was quite difficult as I needed to remove for preparing to tile.
I found mineral turps to work. Basically pour onto the floor and wait a few minutes and follow up with a heavy duty broom (thick bristle) with the rubber strip on the back. This worked well.
At a previous house I lived in, the guys short cutted by not removing the old glue and glued over the top. The glue reacted and about a year later, carpet was beginning to "pocket" (honeycomb underneath) and became a trip hazard. I suspect the reason you would remove the old glue is perhaps incompatibility with a previous product reacting with a new glue. Anyway, just my experience which resulted in a $1000+ re-layering exercise.
Good luck,
Darrin...
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