Well, I succeed in removing passphrase or creating new key without passphrase by using pinentry-gtk-2 as the pinentry program.

  Here is what I've done:

There is no config file in ~/.gnupg.

  I created a symbolic link from /usr/bin/pinentry to /usr/bin/pinentry-gtk-2

sudo ln -s /usr/bin/pinentry-gtk-2 /usr/bin/pinentry

It also worked over an SSH connection with X11 forwarding.

Well, I succeed in removing passphrase or creating new key without passphrase by using pinentry-gtk-2 as the pinentry program. Here is what I have done:

There is no config file in ~/.gnupg. I created a symbolic link from /usr/bin/pinentry to /usr/bin/pinentry-gtk-2

 sudo ln -s /usr/bin/pinentry-gtk-2 /usr/bin/pinentry

It also worked over an SSH connection with X11 forwarding.

Well, i succeed in removing passphrase or creating new key without passphrase by using pinentry-gtk-2 as the pinentry program.

Here is what i've done:

There is no config file in ~/.gnupg.

i created a symbolic link from /usr/bin/pinentry to /usr/bin/pinentry-gtk-2

sudo ln -s /usr/bin/pinentry-gtk-2 /usr/bin/pinentry

It also worked over an SSH connection with X11 forwarding.

Well, I succeed in removing passphrase or creating new key without passphrase by using pinentry-gtk-2 as the pinentry program.

Here is what I've done:

There is no config file in ~/.gnupg.

I created a symbolic link from /usr/bin/pinentry to /usr/bin/pinentry-gtk-2

sudo ln -s /usr/bin/pinentry-gtk-2 /usr/bin/pinentry

It also worked over an SSH connection with X11 forwarding.