[tassos@tassos-pc ~]$ sudo rm /var/lib/pacman/db.lck
[tassos@tassos-pc ~]$ sudo pacman-key --init
[tassos@tassos-pc ~]$ 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...
  -> Locally signing key 0E8B644079F599DFC1DDC3973348882F6AC6A4C2...
  -> Locally signing key 5A97ED6B72418199F0C22B23137C934B5DCB998E...
  -> Locally signing key B4663188A692DB1E45A98EE95BD96CC4247B52CC...
  -> Locally signing key 684148BB25B49E986A4944C55184252D824B18E8...
  -> Locally signing key 35B4FF23EA9477582C2A0AF12B80869C5C0102A6...
  -> Locally signing key 1E7908935AAB9A00D6B47503363DFFFD59152F77...
  -> Locally signing key 44D4A033AC140143927397D47EFD567D4C7EA887...
  -> Locally signing key 77DC01C9971AC3C39A0626F72C089F09AC97B894...
  -> Locally signing key 74C2F2CC05A0AB7D859839938934292D604F8BA2...
  -> Locally signing key 39F0EC1AE50B37E5F3196F09DAD3B211663CA268...
  -> Locally signing key 27FFC4769E19F096D41D9265A04F9397CDFD6BB0...
  -> Locally signing key E4CDFE50A2DA85D58C8A8C70CAA6A59611C7F07E...
  -> Locally signing key AB19265E5D7D20687D303246BA1DFB64FFF979E7...
==> Importing owner trust values...
==> Disabling revoked keys in keyring...
  -> Disabling key F5A361A3A13554B85E57DDDAAF7EF7873CFD4BB6...
  -> Disabling key 7FA647CD89891DEDC060287BB9113D1ED21E1A55...
  -> Disabling key D4DE5ABDE2A7287644EAC7E36D1A9E70E19DAA50...
  -> Disabling key BC1FBE4D2826A0B51E47ED62E2539214C6C11350...
  -> Disabling key FAA6840E8C3FC7F89BEE0DC8AC7AB10BCB6CDD17...
  -> Disabling key 9515D8A8EAB88E49BB65EDBCE6B456CAF15447D5...
  -> Disabling key 4A8B17E20B88ACA61860009B5CED81B7C2E5C0D2...
  -> Disabling key 63F395DE2D6398BBE458F281F2DBB4931985A992...
  -> Disabling key 0B20CA1931F5DA3A70D0F8D2EA6836E1AB441196...
  -> Disabling key 8F76BEEA0289F9E1D3E229C05F946DED983D4366...
  -> Disabling key 540DE7083B89314CF70EA6F0C1B1AD0DA80EBF3E...
  -> Disabling key 66BD74A036D522F51DD70A3C7F2A16726521E06D...
  -> Disabling key 81D7F8241DB38BC759C80FCE3A726C6170E80477...
  -> Disabling key E7210A59715F6940CF9A4E36A001876699AD6E84...
==> Updating trust database...
gpg: next trustdb check due at 2016-06-03
[tassos@tassos-pc ~]$ sudo pacman-key --refresh-keys
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.
[tassos@tassos-pc ~]$ sudo pacman -Sc
warning: database file for 'core' does not exist
warning: database file for 'extra' does not exist
warning: database file for 'community' does not exist
warning: database file for 'multilib' does not exist
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] y
removing old packages from cache...

Database directory: /var/lib/pacman/
:: Do you want to remove unused repositories? [Y/n] y
removing unused sync repositories...