$ gpg --version
gpg (GnuPG) 1.2.0
Copyright (C) 2002 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.

Home: ~/.gnupg
サポートしているアルゴリズム:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA, ELG
gpg: invalid module `/usr/lib/gnupg/idea': gpg: undefined symbol: _idea_get_info
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH
Hash: MD5, SHA1, RIPEMD160
Compress: Uncompressed, ZIP, ZLIB

ほえぇ、IDEAが使えなくなってるよう、お兄ちゃん！

$ sudo apt-get install gpg-idea
Reading Package Lists... Done
Building Dependency Tree... Done
Sorry, gpg-idea is already the newest version.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

なのに！