Looks like it's known upstream.
https://github.com/micahflee/torbrowser-launcher/issues/282
workaround is:-
gpg --homedir "$HOME/.local/share/torbrowser/gnupg_homedir/" --refresh-
keys --keyserver pgp.mit.edu
** Bug watch added: github.com/micahflee/torbrowser-launcher/issues #282
This issue is present in the Third Point release of Ubuntu 16.04
(Witnessed just now in Ubuntu MATE 16.04.3)
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https://bugs.launchpad.net/bugs/1678355
Title:
torbrowser-launcher fails
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: torbrowser-launcher (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1678355
** Description changed:
Trying to install this package results in verification failure on all
attempts to install the browser.
System affected is Ubuntu 16.04 32 bit architecture.
+
+ Command line info:
+ ~$ torbrowser-launcher
+ Tor Browser Launcher
+ By Micah Lee, licensed under MIT
+
