on i686

$ sudo pacman-Syu
...
(29/36) upgrading parabola-keyring                             [##################################] 100%
==> Appending keys from parabola.gpg...
==> Locally signing trusted keys in keyring...
  -> Locally signing key 560B3DEC2F13E822ACED475B2EC52AC76AEEB6A0...
  -> Locally signing key 1B8C5E87702444D3D825CC8086ED62396D5DBA58...
  -> Locally signing key 17446CB76E250EE809DFE1F2A7DC2FC7EBC8F713...
  -> Locally signing key E56B405EC149A89EA4D855E3DA2004473258B1E2...
  -> Locally signing key 49F707A1CB366C580E625B3C456032D717A4CD9C...
  -> Locally signing key 6DB9C4B4F0D8C0DC432CF6E4227CA7C556B2BA78...
  -> Locally signing key 8C3F8ABD30DF2AFAC6C039A45906AB5E9AAD00E5...
  -> Locally signing key 3954A7AB837D0EA9CFA9798925DB7D9B5A8D4B40...
  -> Locally signing key D3EAD7F9D076EB9AF650149DA170D6A0B669E21A...
  -> Locally signing key 2DFFE834A07FC9A06F4AAAF444BC7D7F49B9A5A4...
  -> Locally signing key 1285E187FDE4EF93444F75F9A3CDCDE939A264EE...
  -> Locally signing key CB6E213A349B8DF9E96B622AC3F4FFCF3EAE8697...
  -> Locally signing key 38D33EF29A7691134357648733466E12EC7BA943...
  -> Locally signing key BFA8008A8265677063B11BF47171986E4B745536...
  -> Locally signing key 99195DD3BB6FE10A2F36ED8445698744D4FFBFC9...
  -> Locally signing key 8CD7227DA467D3ED404F6EEFDB590F739E5AC458...
==> Importing owner trust values...
gpg: setting ownertrust to 4
==> Updating trust database...
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: bad data signature from key 20E8A9C77716EB4F: Wrong key usage (0x19, 0x2)
gpg: depth: 0  valid:   1  signed:  33  trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: bad data signature from key 20E8A9C77716EB4F: Wrong key usage (0x19, 0x2)
gpg: depth: 1  valid:  33  signed:  85  trust: 0-, 0q, 0n, 33m, 0f, 0u
gpg: depth: 2  valid:  72  signed:  14  trust: 72-, 0q, 0n, 0m, 0f, 0u
gpg: next trustdb check due at 2018-10-19