Key keeps showing unknown trust

[Hugo Osvaldo Barrera]

Hi.

I'm trying to edit one of my key's trust, but it keeps showing unknown even
after changing it:

  $ gpg --edit-key 1BFBED44
  gpg (GnuPG) 2.1.1; Copyright (C) 2014 Free Software Foundation, Inc.
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.

  Secret key is available.

  pub  rsa2048/1BFBED44
       created: 2010-10-07  expires: never       usage: SCA
       trust: full          validity: unknown
  sub  rsa2048/28C61189
       created: 2010-10-07  expires: never       usage: E
  [ unknown] (1). Hugo Osvaldo Barrera <hugo at barrera.io>
  [ revoked] (2)  Hugo Osvaldo Barrera <hbarrera at aigroup.com.ar>
  [ revoked] (3)  Hugo Osvaldo Barrera <hugo at osvaldobarrera.com.ar>
  [ revoked] (4)  Hugo Osvaldo Barrera (Work Account) <hbarrera at assia-inc.com>

  gpg> trust
  pub  rsa2048/1BFBED44
       created: 2010-10-07  expires: never       usage: SCA
       trust: full          validity: unknown
  sub  rsa2048/28C61189
       created: 2010-10-07  expires: never       usage: E
  [ unknown] (1). Hugo Osvaldo Barrera <hugo at barrera.io>
  [ revoked] (2)  Hugo Osvaldo Barrera <hbarrera at aigroup.com.ar>
  [ revoked] (3)  Hugo Osvaldo Barrera <hugo at osvaldobarrera.com.ar>
  [ revoked] (4)  Hugo Osvaldo Barrera (Work Account) <hbarrera at assia-inc.com>

  Please decide how far you trust this user to correctly verify other users' keys
  (by looking at passports, checking fingerprints from different sources, etc.)

    1 = I don't know or won't say
    2 = I do NOT trust
    3 = I trust marginally
    4 = I trust fully
    5 = I trust ultimately
    m = back to the main menu

  Your decision? 4

  pub  rsa2048/1BFBED44
       created: 2010-10-07  expires: never       usage: SCA
       trust: full          validity: unknown
  sub  rsa2048/28C61189
       created: 2010-10-07  expires: never       usage: E
  [ unknown] (1). Hugo Osvaldo Barrera <hugo at barrera.io>
  [ revoked] (2)  Hugo Osvaldo Barrera <hbarrera at aigroup.com.ar>
  [ revoked] (3)  Hugo Osvaldo Barrera <hugo at osvaldobarrera.com.ar>
  [ revoked] (4)  Hugo Osvaldo Barrera (Work Account) <hbarrera at assia-inc.com>

  gpg> save
  Key not changed so no update needed.

  $ gpg --list-secret-keys
  gpg: checking the trustdb
  gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
  gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
  /home/hugo/.gnupg/pubring.kbx
  -----------------------------
  sec   rsa4096/2B98C0CD 2014-10-22
  uid       [ultimate] Hugo Osvaldo Barrera <hugo at barrera.io>
  ssb   rsa4096/F6AB63C3 2014-10-22

  sec   rsa2048/1BFBED44 2010-10-07
  uid       [ unknown] Hugo Osvaldo Barrera <hugo at barrera.io>
  ssb   rsa2048/28C61189 2010-10-07

I don't think I'm doing something wrong, but: Am I? Did I miss something?
Thanks,

-- 
Hugo Osvaldo Barrera
A: Because we read from top to bottom, left to right.
Q: Why should I start my reply below the quoted text?
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