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I want to use tor browser on my rasberry pi3b+ and I've used terminal by typing: sudo apt-get tor, it worked. But when I run tor in terminal it failed.
it says that :
Could not bind to 127.0.0.1:9050:Address already in use. Is Tor already running?
Failed to parse/validate config: Failed to bind one of the listener ports.
Reading config failed--see warings above
Sorry, I'm a beginner of such things, could anyone teach me about that?
You installed the tor service that can only be used by applications directly. At the tor project you will find at Configure your applications to use Tor:
If you want to use Tor for anonymous web browsing, please use Tor Browser. It comes with readily configured Tor and a browser patched for better anonymity. To use SOCKS directly (for instant messaging, Jabber, IRC, etc), you can point your application directly at Tor (localhost port 9050, or port 9150 for Tor Browser), but see this FAQ entry for why this may be dangerous.
Unfortunately the Tor Browser isn't available directly for Raspbian/Debian from the default repository. You have to install it from the Debian backports site. How to do it you can look at Install from official repository.
tor@default.service. I have corrected the answer.
lsof -i TCP:9050(you may have toapt install lsoffirst) andsudo ps -A | grep -i tor(this is a catchall for any process name with "tor", case insensitive, in it; you may know something more specific if this turns up too much junk but I don't think it will).