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i checked 2 of my ubuntu systems with sudo unhide sys.

On both machines the result is HIDDEN Processes Found: 1

but unhide gives no further information no pid, nothing.

how can i investigate what's this about?

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1 means process ID (not the number of found processes). So you can run:

ps aux

And check what is process with ID=1.

In my case:

root         1  0.0  0.0  23896  2056 ?        Ss   12:40   0:00 /sbin/init
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