Arch Linux

Description:

PGP Signature failure when try install package

Additional info:
* package version(s)
* config and/or log files etc.


Steps to reproduce:
pacman -S atom
resolving dependencies...
looking for conflicting packages...

Packages (6) apm-1.12.6-1 c-ares-1.11.0-1 electron-1.3.3-1 minizip-1:1.1-1 re2-20160301-1 atom-1.9.8-1

Total Download Size: 44.18 MiB
Total Installed Size: 181.23 MiB

:: Proceed with installation? [Y/n]
:: Retrieving packages...
apm-1.12.6-1-x86_64 1877.7 KiB 806K/s 00:02 [###############################################################] 100%
electron-1.3.3-1-x86_64 26.8 MiB 571K/s 00:48 [###############################################################] 100%
atom-1.9.8-1-x86_64 15.5 MiB 536K/s 00:30 [###############################################################] 100%
(6/6) checking keys in keyring [###############################################################] 100%
(6/6) checking package integrity [###############################################################] 100%
error: apm: signature from "Nicola Squartini <tensor5@gmail.com>" is unknown trust
:: File /var/cache/pacman/pkg/apm-1.12.6-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]