While making a GPG key, how can I generate enough entropy?

Issue

• While creating a GPG key, I spend a lot of time trying to generate entropy, but the process doesn't seem to finish:

gpg --gen-key
gpg (GnuPG) 2.0.14; Copyright (C) 2009 Free Software Foundation, Inc.
...
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
hygthtrsfsdfgdfg
hgdsfsfsdfahgfh
dsgafsadfsdfdfg^C
gpg: signal Interrupt caught ... exiting