出处：https://emacs.stackexchange.com/questions/233/how-to-proceed-on-package-el-signature-check-failure
问题可能呈现的状态
package--check-signature: Failed to verify signature
ascii-art-to-unicode-1.9.el.sig: ("No public key
for 474F05837FBDEF9B created at 2014-09-24T16:20:01+0200
using DSA")
解决方法
- set package-check-signature to nil, e.g.
M-: (setq package-check-signature nil) RET - download the package gnu-elpa-keyring-update and run the function with the same name, e.g.
M-x package-install RET gnu-elpa-keyring-update RET. - reset package-check-signature to the default value allow-unsigned，e.g.
M-: (setq package-check-signature t) RET
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