l which is the sgte:
1- I open nautilus with root privileges: alt + f2 ... and: gksu nautilus.
2- go to / var / lib / dpkg / info,
3- there I delete all files that refer to "name-of-package".
4- close the nautilus and open Synaptic.
5- now looking "package-name", I put it marked to remove and give to apply.
6- Now if the "name-of-pack" is deleted.
7- longer works correctly Synaptic, lets you install, uninstall, delete, etc.
or if this does not work ...
within var / lib / dpkg / status file replace the line
Status: install reinstreq half-installed
by
Status: install ok installed
God bless