Importing new subkeys

[Phillip Susi]

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So my old subkeys are about to expire so I created some new ones at
home and exported them with --export-secret-subkeys.  When I try to
import them at work, gpg just says I already have that key and stops.
Why isn't it merging the new subkeys?  I ended up having to delete
the master key from the keyring in order to import the new subkeys.

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