phablet@ubuntu-phablet:~$ pkcon install-local --allow-untrusted com.ubuntu.puritine_0.2_armhf.click 
Installing files              [=========================]         
Finished                      [=========================]         
Installing files              [=========================]         
Starting                      [=========================]         
Finished                      [=========================]         
Fatal error: /home/phablet/com.ubuntu.puritine_0.2_armhf.click failed to install.
Cannot install /home/phablet/com.ubuntu.puritine_0.2_armhf.click: Signature verification error: debsig: /home/phablet/com.ubuntu.puritine_0.2_armhf.click does not appear to be a deb format package