This is the result
$ sudo pacman -Scc
error: failed to init transaction (unable to lock database)
error: could not lock database: File exists
if you're sure a package manager is not already
running, you can remove /var/lib/pacman/db.lck
[roll@roll ~]$ sudo rm /var/lib/pacman/db.lck
[roll@roll ~]$ sudo pacman -Scc
Cache directory: /var/cache/pacman/pkg/
:: Do you want to remove ALL files from cache? [y/N] y
removing all files from cache...
Database directory: /var/lib/pacman/
:: Do you want to remove unused repositories? [Y/n] y
removing unused sync repositories...
[roll@roll ~]$ sudo pacman -S manjaro-keyring archlinux-keyring
warning: downgrading package manjaro-keyring (20141220-1 => 20141014-1)
warning: downgrading package archlinux-keyring (20141218-1 => 20140908-1)
resolving dependencies...
looking for conflicting packages...
Packages (2) archlinux-keyring-20140908-1 manjaro-keyring-20141014-1
Total Download Size: 0.45 MiB
Total Installed Size: 0.64 MiB
Net Upgrade Size: -0.04 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages ...
manjaro-keyring-201... 14.9 KiB 15.8K/s 00:01 [####################] 100%
archlinux-keyring-2... 444.8 KiB 17.5K/s 00:25 [####################] 100%
(2/2) checking keys in keyring [####################] 100%
(2/2) checking package integrity [####################] 100%
error: manjaro-keyring: signature from "Rob McCathie <korrode@gmail.com>" is unknown trust
:: File /var/cache/pacman/pkg/manjaro-keyring-20141014-1-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.
[roll@roll ~]$ sudo pacman-key --init
gpg: key 7890AD0D was created 11154 seconds in the future (time warp or clock problem)
[roll@roll ~]$ sudo pacman -S manjaro-keyring archlinux-keyring
warning: downgrading package manjaro-keyring (20141220-1 => 20141014-1)
warning: downgrading package archlinux-keyring (20141218-1 => 20140908-1)
resolving dependencies...
looking for conflicting packages...
Packages (2) archlinux-keyring-20140908-1 manjaro-keyring-20141014-1
Total Download Size: 0.01 MiB
Total Installed Size: 0.64 MiB
Net Upgrade Size: -0.04 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages ...
manjaro-keyring-201... 14.9 KiB 7.46K/s 00:02 [####################] 100%
(2/2) checking keys in keyring [####################] 100%
(2/2) checking package integrity [####################] 100%
error: manjaro-keyring: signature from "Rob McCathie <korrode@gmail.com>" is unknown trust
:: File /var/cache/pacman/pkg/manjaro-keyring-20141014-1-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.
[roll@roll ~]$ sudo pacman-key --populate archlinux manjaro
==> Appending keys from archlinux.gpg...
==> Appending keys from manjaro.gpg...
==> Locally signing trusted keys in keyring...
-> Locally signing key 7C89F4D439B2BFACF425107B62443D89B35859F8...
==> ERROR: 7C89F4D439B2BFACF425107B62443D89B35859F8 could not be locally signed.
-> Locally signing key 0E8B644079F599DFC1DDC3973348882F6AC6A4C2...
==> ERROR: 0E8B644079F599DFC1DDC3973348882F6AC6A4C2 could not be locally signed.
-> Locally signing key 5A97ED6B72418199F0C22B23137C934B5DCB998E...
==> ERROR: 5A97ED6B72418199F0C22B23137C934B5DCB998E could not be locally signed.
-> Locally signing key FAA6840E8C3FC7F89BEE0DC8AC7AB10BCB6CDD17...
==> ERROR: FAA6840E8C3FC7F89BEE0DC8AC7AB10BCB6CDD17 could not be locally signed.
-> Locally signing key B4663188A692DB1E45A98EE95BD96CC4247B52CC...
==> ERROR: B4663188A692DB1E45A98EE95BD96CC4247B52CC could not be locally signed.
-> Locally signing key 684148BB25B49E986A4944C55184252D824B18E8...
==> ERROR: 684148BB25B49E986A4944C55184252D824B18E8 could not be locally signed.
-> Locally signing key 540DE7083B89314CF70EA6F0C1B1AD0DA80EBF3E...
==> ERROR: 540DE7083B89314CF70EA6F0C1B1AD0DA80EBF3E could not be locally signed.
-> Locally signing key 35B4FF23EA9477582C2A0AF12B80869C5C0102A6...
==> ERROR: 35B4FF23EA9477582C2A0AF12B80869C5C0102A6 could not be locally signed.
-> Locally signing key 1E7908935AAB9A00D6B47503363DFFFD59152F77...
==> ERROR: 1E7908935AAB9A00D6B47503363DFFFD59152F77 could not be locally signed.
-> Locally signing key 44D4A033AC140143927397D47EFD567D4C7EA887...
==> ERROR: 44D4A033AC140143927397D47EFD567D4C7EA887 could not be locally signed.
-> Locally signing key 77DC01C9971AC3C39A0626F72C089F09AC97B894...
==> ERROR: 77DC01C9971AC3C39A0626F72C089F09AC97B894 could not be locally signed.
-> Locally signing key 74C2F2CC05A0AB7D859839938934292D604F8BA2...
==> ERROR: 74C2F2CC05A0AB7D859839938934292D604F8BA2 could not be locally signed.
-> Locally signing key 27FFC4769E19F096D41D9265A04F9397CDFD6BB0...
==> ERROR: 27FFC4769E19F096D41D9265A04F9397CDFD6BB0 could not be locally signed.
-> Locally signing key E4CDFE50A2DA85D58C8A8C70CAA6A59611C7F07E...
==> ERROR: E4CDFE50A2DA85D58C8A8C70CAA6A59611C7F07E could not be locally signed.
-> Locally signing key AB19265E5D7D20687D303246BA1DFB64FFF979E7...
==> ERROR: AB19265E5D7D20687D303246BA1DFB64FFF979E7 could not be locally signed.
[roll@roll ~]$ sudo pacman-key --refresh-keys
gpg: key 7890AD0D was created 11115 seconds in the future (time warp or clock problem)
gpg: refreshing 88 keys from hkp://pool.sks-keyservers.net
gpg: connecting dirmngr at '/root/.gnupg/S.dirmngr' failed: IPC connect call failed
gpg: keyserver refresh failed: No dirmngr
==> ERROR: A specified local key could not be updated from a keyserver.
[roll@roll ~]$ sudo pacman -Sc
Packages to keep:
All locally installed packages
Cache directory: /var/cache/pacman/pkg/
:: Do you want to remove all other packages from cache? [Y/n]
removing old packages from cache...
Database directory: /var/lib/pacman/
:: Do you want to remove unused repositories? [Y/n]
removing unused sync repositories...