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Enigmail failure when sending signed mails

I wanted to send a GPG signed email, using Thunderbird and Enigmail. When hitting the send button, nothing happend. After taking a look in the Enigmail log, I found this:

2018-01-16 14:52:43.481 [DEBUG] errorHandling.jsm: parseErrorOutputWith: return with c.errorMsg = gpg: Beglaubigung fehlgeschlagen: Inappropriate ioctl for device
gpg: [stdin]: sign+encrypt failed: Inappropriate ioctl for device
2018-01-16 14:52:43.481 [DEBUG] execution.jsm: EnigmailExecution.fixExitCode: agentType: gpg exitCode: undefined statusFlags 0
2018-01-16 14:52:43.481 [DEBUG] encryption.jsm: encryptMessageEnd: command execution exit code: undefined
2018-01-16 14:52:44.664 [DEBUG] mimeEncrypt.js: finishCryptoEncapsulation: exitCode = undefined
2018-01-16 14:52:44.665 [ERROR] mimeEncrypt.js: caught exception: undefined
Message: 'undefined'
File:    undefined
Line:    undefined
Stack:   undefined

After searching around in the internet, I found the solution: GPG can’t find a method to ask for my GPG key passphrase. dnf install pinentry-gtk solved the problem.

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