subkeys hate me

[John Kane]

To the best of my knowledge, on your original system you'd do:
   gpg  --armor -o mysecret.asc --export-secret-keys  myemail@myemail.net
   gpg  --armor -o mypubkey.asc --export  myemail@myemail.net

and on the second system (if you have gpg) do:
   gpg  --allow-secret-key-import  --import  mysecret.asc
   gpg  --import  mypubkey.asc

Note that the 'mysecret.asc' text file contains only the secret part
of your key, and you need to transfer both the public and private
parts to make the key behave properly on the new system.