You have to do an update on a terminal before using synaptic or any other package manager. I just done it few minutes later and i have no error message
-- Encountered a section with no Package: header https://bugs.launchpad.net/bugs/194436 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
