"no valid subkey"

[Erik Josefsson]

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Dear all,

This might not be the best place for beginners to ask for help, but the
reason I subscribed is that icedove says I have "no valid subkey" to my
two registered email addresses:

http://pgp.surfnet.nl:11371/pks/lookup?op=vindex&fingerprint=on&search=0xB240C11D

Further, a friend told me that his key-manager won't let him encrypt to
one of them.

A pointer to a beginners "how to" fix this would be much appreciated.

Best regards.

//Erik
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