#Name: "error: gpg failed to sign the data" Fix
#By KlausDevWalker
#Version: N/D
#Release Date: September 4th, 2019

#I solved this error just installing the following package on Arch Linux from AUR
$ yay libgtkhtml

#Its dependencies for building it are a drag but the package itself is tiny in size (less then 1 MB). I installed with yay and choose remove them after built

#You can test it creating a dummy file and try to sign it
$ touch a.txt && gpg --sign a.txt

#I hope you can solve this annoying error with the information above. Share without moderation :)