Working with this problem, the actually configured sources.list has various distributions to download the packages: stable, testing, unstable and experimental, and a preferences file that gives preference to unstable.
then, I have tested what happens if we use only the unstable distribution in sources.list Therefore, mktemp can be removed and is not considered an essential package, now the behaviour is correct, I believe that is an apt bug, because apt does not take the attributes of the package in the distribution that must be installed but it takes the attributes from the package corresponding to the first distribution on the list. Regards, Jordi Pujol -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org