求解 GPG 导入后不能使用

[AntonChen]

以前生成的密钥对，最近重装系统后导入发觉不能用了。
Google 了好久也没找到哪儿的问题（ macOS 、Debian 都试过同样的问题），请各位大佬看看，谢谢。

下面是在 Debian 上的一些基本情况。

GPG 版本：

# gpg --version
gpg (GnuPG) 2.2.40
libgcrypt 1.10.1
Copyright (C) 2022 g10 Code GmbH
License GNU GPL-3.0-or-later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: /root/.gnupg
Supported algorithms:
Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
        CAMELLIA128, CAMELLIA192, CAMELLIA256
Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2

公钥：

# gpg -k --keyid-format long
/root/.gnupg/pubring.kbx
------------------------
pub   rsa4096/F2215CFC0976F86F 2017-08-05 [C]
      FC99D7294A552BFAEDD018F6F2215CFC0976F86F
uid                 [ultimate] Anton Chen <[e-mail]>
sub   rsa4096/CE0FDC02360FD82C 2017-08-05 [S]
sub   rsa4096/91ACDEB9013FFE65 2017-08-05 [E]
sub   rsa4096/D9D6D4C9E6788098 2017-12-22 [A]

私钥：

# gpg -K --keyid-format long
/root/.gnupg/pubring.kbx
------------------------
sec   rsa4096/F2215CFC0976F86F 2017-08-05 [C]
      FC99D7294A552BFAEDD018F6F2215CFC0976F86F
uid                 [ultimate] Anton Chen <[e-mail]>
ssb#  rsa4096/CE0FDC02360FD82C 2017-08-05 [S]
ssb#  rsa4096/91ACDEB9013FFE65 2017-08-05 [E]
ssb#  rsa4096/D9D6D4C9E6788098 2017-12-22 [A]

测试：

# echo "test" | gpg --clearsign -v
gpg: using pgp trust model
gpg: no default secret key: Unusable secret key
gpg: [stdin]: clear-sign failed: Unusable secret key

[GeruzoniAnsasu]

这方法也不行吗

[xiri]

试试-u 指定一下私钥？这提示不是说没有可用的私钥么

[billlee]

你是怎么导入的，ssb# 这个是没找到私钥吧