After I did fresh install of Ubuntu 15.10 I had to setup GPG encryption with Evolution again and it is not working properly (prior to fresh install it worked fine on Ubuntu 15.04

After I select Option > GPG encrypt I am getting this error:

Because "gpg: CEF41E5C: skipped: unusable public key gpg: [stdin]: encryption failed: unusable public key ", you may need to select different mail options.

How to fix this error? thanks in advance :)

5

1 Answer

I found the solution by myself.

You have two keys, one is pub and other is sub

edward@computer:~$ gpg --edit-key CEF41E5C
gpg (GnuPG) 1.4.18; 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 4096R/CEF41E5C created: 2015-07-27 expires: never usage: SC trust: full validity: unknown
sub 4096R/BB84D566 created: 2015-07-27 expired: 2015-08-26 usage: E
[ unknown] (1). edward torvalds (encrypt the world) <>

as you can see my pub key is fine but sub key is expired
now select sub key

key 1

next

expire

then enter the time after which it should expire, I choose 0 which means never

save

Done! :-)

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