Ok, uninstall and reinstall solved this json-c update problem (but I cannot why), and after that stocked the upgrade jack and jack2 conflict problem.
Regularly again and again these upgrade problems are annoyed me.
I will edit the post.
Ohh, Lost my mind:
:: Synchronizing package databases... lib32 is up to date core is up to date desktop is up to date gtk is up to date :: Starting full system upgrade... resolving dependencies... looking for conflicting packages... :: jack2 and jack are in conflict. Remove jack? [y/N] error: unresolvable package conflicts detected error: failed to prepare transaction (conflicting dependencies) :: jack2 and jack are in conflict