Some days ago I tried to install the Tor Browser on a computer with Manjaro, an operating system based on Arch Linux.
The installation did not work because the distribution did not recognize the public key signing key (PGP) as legitimate.
So I had the following error:
If you encounter the same problem in all distributions which have like base Arch Linux (Antergos, Apricity Os, Manjaro, Archbang, Bridge Linux) follow the steps below:
Add the (same) key manually from the terminal with the following command
gpg --keyyserver pool.sks-keyservers.net --recv-keys 2E1AC68ED40814E0
and run the installation command from AUR
yaourt -S tor-browser-en
Follow the instructions displayed on the terminal by adding the yes or no that are needed and the installation will proceed smoothly without errors.
So Tor Browser will appear on your system: