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According to the docs there, dupeguru isn't maintained any more. The latest binary versions provided are for Ubuntu (Trusty and Xenial). They would probably not be compatible with the libraries on any version of Mint. So if you still want it, I'd advise building it locally.
The procedure seems to be simple: just make and make run.
If you had googled, you could easily have found out that PPA stands for Personal Package Archive. And if you had googled that, you would have found something like this.
It all looks very complicated to me, far more so than just building it yourself from source.
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