POSTIN

/bin/sh

update-alternatives --install /usr/lib/ssh/ssh-askpass ssh-askpass /usr/lib/ssh/qt4-ssh-askpass 50
update-alternatives --install /usr/bin/ssh-askpass bssh-askpass /usr/lib/ssh/qt4-ssh-askpass 50

POSTUN

/bin/sh

[ $1 = 0 ] || exit 0
update-alternatives --remove ssh-askpass /usr/lib/ssh/qt4-ssh-askpass
update-alternatives --remove bssh-askpass /usr/lib/ssh/qt4-ssh-askpass