$ gpg2 --edit-key  616BF511
gpg (GnuPG) 2.2.2; Copyright (C) 2017 Free Software Foundation, Inc.
pub  rsa2048/97341836616BF511
     created: 2017-03-12  expires: never       usage: SC
     trust: unknown       validity: unknown
sub  rsa2048/A36702DCC4193F1E
     created: 2017-03-12  expires: never       usage: E
sub  rsa2048/B67D1153855D94C4
     created: 2017-03-12  expires: never       usage: A
sub  rsa2048/2B8BE9E5D93A1D94
     created: 2017-03-12  expires: never       usage: S
[ unknown] (1). Salmaan Rashid <salrashid123@gmail.com>


gpg> trust
pub  rsa2048/97341836616BF511
     created: 2017-03-12  expires: never       usage: SC
     trust: unknown       validity: unknown
sub  rsa2048/A36702DCC4193F1E
     created: 2017-03-12  expires: never       usage: E
sub  rsa2048/B67D1153855D94C4
     created: 2017-03-12  expires: never       usage: A
sub  rsa2048/2B8BE9E5D93A1D94
     created: 2017-03-12  expires: never       usage: S
[ unknown] (1). Salmaan Rashid <salrashid123@gmail.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? 5
Do you really want to set this key to ultimate trust? (y/N) y
pub  rsa2048/97341836616BF511
     created: 2017-03-12  expires: never       usage: SC
     trust: ultimate      validity: unknown
sub  rsa2048/A36702DCC4193F1E
     created: 2017-03-12  expires: never       usage: E
sub  rsa2048/B67D1153855D94C4
     created: 2017-03-12  expires: never       usage: A
sub  rsa2048/2B8BE9E5D93A1D94
     created: 2017-03-12  expires: never       usage: S
[ unknown] (1). Salmaan Rashid <salrashid123@gmail.com>
Please note that the shown key validity is not necessarily correct
unless you restart the program.

gpg> quit