Public bug reported:

After doing a fresh install of Ubuntu Desktop 16.04.2, I used Ubuntu
Software Center to install Tor Browser (Tor Browser Launcher). I then
click on the Tor icon to start the initial download of the Tor Browser
Bundle. The download completes, but the subsequent signature
verification fails with a message "SIGNATURE VERIFICATION FAILED". The
message also suggests that I might be under attack (very unlikely) or
that there might be a networking problem. I am using a stable network,
have not had network problems with other applications, and repeating the
download, even after redoing the Ubuntu installation, does not change
any behavior.

Additional information, which I can copy here if it is helpful, is listed at:
    https://answers.launchpad.net/ubuntu/+question/526440

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: torbrowser-launcher 0.2.4-1
ProcVersionSignature: Ubuntu 4.8.0-39.42~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-39-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Mar  6 14:25:26 2017
ExecutablePath: /usr/bin/torbrowser-launcher
InstallationDate: Installed on 2017-03-04 (2 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
InterpreterPath: /usr/bin/python2.7
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 XDG_RUNTIME_DIR=<set>
SourcePackage: torbrowser-launcher
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: torbrowser-launcher (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1670506

Title:
  Tor browser launcher signature verification failed on initial download

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