How to transfer GPG key to another computer

Look into GPG's import and export functions.

So, on the old computer (replacing FFFFFFFF as appropriate):

gpg --export -a FFFFFFFF > public.asc
gpg --export-secret-keys -a FFFFFFFF > secret.asc

On the new computer:

gpg --import public.asc
gpg --import secret.asc
gpg --edit-key FFFFFFFF (and set the trust level and whatever else.)

Note: This post only shows how to export private keys, which in your case, is done on the old computer.

Export your OpenPGP private key through Seahorse

1. Right click on your own key.

2. Click on Properties.

3. Click on the Details tab.

4. Click on the icon near Export full key.

5. Choose a name and a location for the file which will hold the key.

Export your OpenPGP private key through GnuPG

gpg --export-secret-keys --armor --output "[Name here].asc"

Or:

gpg --export-secret-keys -a -o "[Name here].asc"

Best regards, ADFENO.
Have a nice day.

Addendum: You can check if it really is your private key just by opening the exported file with your preferred plain text editor, it must begin with "-----BEGIN PGP PRIVATE KEY BLOCK-----".

thank you for this!

i guess the same applies for putting it on your phone using k-9?

For completeness sake,
What if you have your keys in a separtate /home partition and you have to reinstall trisquel?

Will seahorse be OK with using the settings in .gpg?

Beside all this import / export mumbo jumbo one can simply zip up ~/.gnupg, transfer it to the other system via a safe channel and unzip the file to ~/.gnupg

I just did so some weeks ago and everything works like a charm. Even Thunderbird with Enigmail.

HTH,
Holger