[MacPorts] #49233: selfupdate fails with "Failed to verify signature for MacPorts source"

[MacPorts]

#49233: selfupdate fails with "Failed to verify signature for MacPorts source"
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  Reporter:  n.gilbert@…     |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  High            |  Milestone:
 Component:  server/hosting  |    Version:  2.3.3
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ionic@…):

 Please use `sudo port sync` to synchronize your ports tree if a base
 upgrade is not necessary for the time being.

 The `selfupdate` operation is a "base upgrade" + "sync" operation at once.

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Ticket URL: <https://trac.macports.org/ticket/49233#comment:9>
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