[root@ping daenglinux]# pacman -Syu
:: Synchronizing package databases...
 core is up to date
 archlinuxfr is up to date
 extra is up to date
 archlinuxfr is up to date
 community is up to date
 archlinuxfr is up to date
 archlinuxfr is up to date
:: Starting full system upgrade...
warning: libfm: local (0.1.17-1) is newer than archlinuxfr (0.1.16-1)
warning: pcmanfm: local (0.9.10-1) is newer than archlinuxfr (0.9.9-1)
resolving dependencies...
looking for inter-conflicts...

Targets (2): colord-0.1.16-1  inetutils-1.9.1-1

Total Installed Size:   2.20 MiB
Net Upgrade Size:       -0.00 MiB

Proceed with installation? [Y/n] y
(2/2) checking package integrity                                                                     [############################################################] 100%
warning: Public keyring not found; have you run 'pacman-key --init'?
error: colord: key "E8F18BA1615137BC" is unknown
error: key "E8F18BA1615137BC" could not be looked up remotely
error: inetutils: key "FCF2CB179205AC90" is unknown
error: key "FCF2CB179205AC90" could not be looked up remotely
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.