Thanks Igor,
I misslead you to a certain point with my question. I do not have Galcore in my system apparently(Wheezy), and I tought that an upgrade to Jessie would solve the problem(get galcore installed) but still have the same problem..the upgrade does not work because of that Galcore. I need Galcore and I do not know why I do not have it and how to get it. I need Galcor to install my USB monitor with displaylink. I do not need to upgrade to Jessie..
Your help is really appreciated,
Thanks again