I think it could be a path problem.
I change this line in synaptic.desktop Exec=synaptic-pkexec with Exec=/usr/sbin/synaptic-pkexec
And now it works.
I think it could be a path problem.
I change this line in synaptic.desktop pkexec sbin/synaptic- pkexec
Exec=synaptic-
with
Exec=/usr/
And now it works.