Could be, i am not so deep into this whole linux-magic.
Its raspian stretch with kernel 4.19.66 on a PI2B, which is -as far as i know- from august 2019.
 
apt install tor offers me tor version 2.9.6.xx, enabling the experimental from debian-stack offers 0.3.4.x
 
Any idea how to get a newer version?
 
Gesendet: Dienstag, 08. Oktober 2019 um 01:09 Uhr
Von: "Roger Dingledine" <arma@torproject.org>
An: tor-relays@lists.torproject.org
Betreff: Re: [tor-relays] obfs4 bridge stuck at 0% bootstrap
On Mon, Oct 07, 2019 at 11:09:53PM +0200, Volker Mink wrote:
> <div>After a fresh installation syslog is full with entries like this:</div>
[...]
> Oct&nbsp; 7 23:05:09 pi-hole systemd[1]: Failed to start Anonymizing overlay network for TCP.<br/>

My next guess is that you have an old-style raspbian, with an old
arm-based cpu architecture that is not compatible with modern Debian, but
you have installed the modern Debian tor deb. If that's what's happening,
the binary won't run because it's for a different arch.

Now your quest has simplified to "get Tor running at all, by figuring
out what operating system you're actually running, and finding an
up-to-date Tor package that is intended for that operating system." :)

--Roger

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