SELinux hook error: unable to write to pipe (Broken pipe)?

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I’m having a hard time to replicate what you are doing, I might not understand so please elaborate, below the steps

The sudo-selinux package is a AUR package (I’ve take the liberty to change the category)

$ pamac search --aur  sudo-selinux                                
sudo-selinux                                                    1.9.8.p2-1  AUR

Installing it with that pacman command should not work, unless you changed something in the repositories?

Installing it with pamac should work if you enable AUR support.
$ pamac install sudo-selinux

However this results in an error on my end:

$ pamac install sudo-selinux                                    
Warning: sudo-selinux is only available from AUR
Preparing...

<snip>

Verifying source file signatures with gpg...
    Linux-PAM-1.5.2.tar.xz ... FAILED (unknown public key A8041FA839E16E36)
==> ERROR: One or more PGP signatures could not be verified!
Error: Failed to build pam-selinux
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