Infatti ci avevo pensato....

ma niente ....
inizialmente erano 5 i pacchetti difettosi....ne sono riuscito a disinstallare 2 dal Synaptic....e ora ne sono rimasti 3.
Quando per esempio do il comando
sudo apt-get upgrade l'output che visualizzo è questo:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
libsdl-gfx1.2-4 libsdl-image1.2 libsdl-ttf2.0-00 upgraded, 0 newly installed,
3 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 352kB disk space will be freed.
Do you want to continue [Y/n]? Y
(Reading database ... 182547 files and directories currently installed.)
Removing libsdl-gfx1.2-4 ...
dpkg (subprocess):
unable to execute installed post-removal script: Exec format errordpkg: error processing libsdl-gfx1.2-4 (--remove):
subprocess installed post-removal script returned error exit status 2
Removing libsdl-image1.2 ...
dpkg (subprocess): unable to execute installed post-removal script: Exec format error
dpkg: error processing libsdl-image1.2 (--remove):
subprocess installed post-removal script returned error exit status 2
Removing libsdl-ttf2.0-0 ...
dpkg (subprocess): unable to execute installed post-removal script: Exec format error
dpkg: error processing libsdl-ttf2.0-0 (--remove):
subprocess installed post-removal script returned error exit status 2
Errors were encountered while processing:
libsdl-gfx1.2-4
libsdl-image1.2
libsdl-ttf2.0-0
E: Sub-process /usr/bin/dpkg returned an error code (1)
...sto sbagliando qualcosa?