Ah, encontrei a resposta:
sudo pacman -S manjaro-keyring
A atualização do chaveiro primeiro resolve o problema acima.
Estou tentando atualizar meus sistemas, até tentei usar outro espelho, mas ele sempre mostra signature from <email> unknown trust , [package-file] is corrupted (invalid or corrupted package (PGP signature)) como resolver esse problema?
$ sudo pacman -Syu
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
multilib is up to date
tokumx is up to date
:: Starting full system upgrade...
:: Replace attica with extra/attica-qt4? [Y/n] y
:: Replace dirmngr with core/gnupg? [Y/n] y
:: Replace gtk-theme-menda with extra/menda-themes? [Y/n] y
:: Replace lxpolkit with community/lxsession? [Y/n] y
resolving dependencies...
looking for inter-conflicts...
Packages (397):
Name Old Version New Version Net Change Download Size
community/acpid 2.0.23-1 2.0.23-3 0.00 MiB
extra/adwaita-icon-theme 3.14.1-1 13.66 MiB
extra/at-spi2-atk 2.12.1-1 2.14.1-1 0.00 MiB
extra/at-spi2-core 2.12.0-1 2.14.1-1 -0.04 MiB
extra/atk 2.12.0-1 2.14.0-1 0.03 MiB
attica 0.4.2-1 -1.09 MiB
extra/attica-qt4 0.4.2-1 1.09 MiB
extra/attica-qt5 5.3.0-1 5.4.0-1 0.00 MiB
extra/avahi 0.6.31-13 0.6.31-14 0.00 MiB
core/binutils 2.24-7 2.24-8 0.04 MiB
extra/bluez 5.24-1 5.25-2 0.00 MiB
...
extra/xscreensaver 5.30-1 5.32-1 3.04 MiB
extra/yaourt 1.5-1 1.5-1.1 0.00 MiB 0.07 MiB
extra/yelp 3.12.0-1 3.14.1-1 -0.12 MiB
extra/yelp-xsl 3.12.0-1 3.14.0-1 0.00 MiB
community/youtube-dl 2014.10.13-1 2014.11.24-1 0.20 MiB
extra/zenity 3.12.1-2 3.14.0-1 0.02 MiB
community/zeromq 4.0.4-4 4.0.5-1 0.01 MiB
Total Download Size: 40.25 MiB
Total Installed Size: 3550.46 MiB
Net Upgrade Size: -5.18 MiB
:: Proceed with installation? [Y/n] y
:: Retrieving packages ...
ckbcomp-0.1.6-1-any 24.3 KiB 11.9M/s 00:00 [##################################################################################] 0%
keyboardctl-0.1.6-1-any 27.6 KiB 6.74M/s 00:00 [##################################################################################] 0%
openvpn-2.3.5-1.20-x86_64 371.5 KiB 10.1M/s 00:00 [##################################################################################] 0%
firefox-34.0.5-0.10-x86_64 38.9 MiB 5.72M/s 00:07 [##################################################################################] 96%
manjaro-settings-manager-0.4.3-1-x86_64 40.0 MiB 5.69M/s 00:07 [##################################################################################] 99%
yaourt-1.5-1.1-any 40.1 MiB 5.70M/s 00:07 [##################################################################################] 99%
lxsession-1:0.5.1-1.1-x86_64 40.2 MiB 5.71M/s 00:07 [##################################################################################] 100%
(393/393) checking keys in keyring [##################################################################################] 100%
(393/393) checking package integrity [##################################################################################] 100%
error: firefox: signature from "Alexandru Ianu <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/firefox-34.0.5-0.10-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: ckbcomp: signature from "Ramon Buldó <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/ckbcomp-0.1.6-1-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: keyboardctl: signature from "Ramon Buldó <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/keyboardctl-0.1.6-1-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: lxsession: signature from "Ramon Buldó <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/lxsession-1:0.5.1-1.1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: manjaro-settings-manager: signature from "Ramon Buldó <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/manjaro-settings-manager-0.4.3-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: openvpn: signature from "Alexandru Ianu <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/openvpn-2.3.5-1.20-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: yaourt: signature from "Alexandru Ianu <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/yaourt-1.5-1.1-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.