fix gpg unusable key
when we import gpg keys from backup, and try to use it for decript/encript, it will tell that the key is not usable,
we need to trust the keys first
use gpg --list-keys to list all keys
the output would like this
1 | pub 2048R/B660885G 2013-05-16 [expires: 2030-12-31] |
we can get the keys id here B660885G
and then gpg>trust
If you’re sure about the authenticity of your key, select the trust level 5.