sudo apt-get install tor
After runing tor you can see the log of the tor by
journalctl -exft Tor
If the service started without errors, look at the Tor log
sudo journalctl -b --no-pager /usr/bin/tor
sudo apt install obfs4proxy
then you should get the bridge line. for get the bridge line go to https://bridges.torproject.org/ and get your bridge line.
nano /etc/tor/torrc
UseBridges 1 ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy Bridge obfs4 132.145.63.40:47347 5C72EEEE587AB1C7021A78707DAB80427F7A9B43 cert=HAZq1DmA4kR1/IFy1TBeSd67BNQI4SDur+U3zxun+G7HCWJ+x66eUyM6/sariPQYDJ9aIw iat-mode=0 Bridge obfs4 132.226.205.56:1991 6CA77FBE6752502259A3D0079F1C510663166404 cert=yrWZOUqsfQ9IyCj3LFwXSqFqbh+59S+1P9yPh/obHt4fbVYrE3ypGthX/+ZvM207I3xIBQ iat-mode=0 Bridge obfs4 45.33.1.189:9123 F9DFF618E7BA6C018245D417F39E970C2F019BAA cert=mDZuXuqSTjX1OjN7zLybTYzNi0A21A7G0DRNmW79029cSvLYSOk/KhGftcnmxruTmhRfZQ iat-mode=0
systemctl restart tor.service
References
https://askubuntu.com/questions/1183145/how-can-i-configure-tor-with-bridge-and-privoxy-to-proxy-entire-system
https://askubuntu.com/questions/607961/error-with-tor-in-ubuntu14-04