Check Debian Package Source
1dpkg -s <package>
2apt-cache showpkg <package>
See details in https://askubuntu.com/questions/8560/how-do-i-find-out-which-repository-a-package-comes-from
1dpkg -s <package>
2apt-cache showpkg <package>
See details in https://askubuntu.com/questions/8560/how-do-i-find-out-which-repository-a-package-comes-from