Package: hopenpgp-tools Version: 0.19.4-3 gnupgp versions 2.1 and higher store public (and private) keys in keybox format in ~/.gnupg/pubring.kbx
hkt tries to open ~/.gnupg/pubring.gpg which is correct for gnupg versions lower than 2.1 Because hkt tries to open ~/.gnupg/pubring.gpg which does not exist, hkt fails with the following error: amnesia@amnesia:~$ hkt export-pubkeys 0x9BB25A1A5C1D9108 hkt (hopenpgp-tools) 0.19.4 Copyright (C) 2012-2016 Clint Adams hkt comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions. hkt: /home/amnesia/.gnupg/pubring.gpg: openBinaryFile: does not exist (No such file or directory)