Newer Tor Versions from the Whonix Repository
Newer Tor versions can be installed by enabling the Whonix stable-proposed-updates repository in Whonix-Gateway (
whonix-gw-14) and then upgrading the system as usual. This is only recommended for testers.
Even Newer Tor Versions from The Tor Project Repository
Not fully documented. Testers only.
Note: This action risks breaking connectivity, for instance if the latest Tor version from deb.torproject.org has not been fully tested by Whonix developers at a specific point in time. 
To proceed despite the risk, install the even newer Tor version by enabling the deb.torproject.org repository. The anon-shared-build-apt-sources-tpo package must be installed. This enables The Tor Project's apt-get signing key and installs the apt source torproject.list. 
In Whonix-Gateway (
whonix-gw-14), update the package lists.
sudo apt-get update
sudo apt-get install anon-shared-build-apt-sources-tpo
Refresh the package lists. 
sudo apt-get update
Install the (potentially) newer version of the
tor package, as well as the
deb.torproject.org-keyring package which keeps the Tor Project repository apt key up-to-date. 
sudo apt-get install tor deb.torproject.org-keyring
- This has happened in the past. For example, on one occasion Tor from deb.torproject.org came with AppArmor changes that were incompatible with anon-gw-anonymizer-config's /etc/apparmor.d/local/system_tor.anondist which resulted in Tor's systemd unit failing.
- Alternatively you can use The Tor Project's native instructions for Debian, but these manual steps are more difficult and involved. The verification of The Tor Project apt-get signing key is also harder. Since you already trust Whonix, the logical choice is to trust another Whonix package to install the right signing key.
- So the newly installed /etc/apt/sources.list.d/torproject.list takes effect.
- A later version of Tor will not always be installed. For example, at the time of writing the stretch repositories for both packages.debian.org and deb.torproject.org have identical Tor versions. As the Debian stable release ages, the likelihood of receiving a newer Tor version from deb.torproject.org increases.
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