Hi all: I appreciate everyone’s answer, now I’m clear that “aptitude” is still one of the main tool for package managing.
I installed from a CD Rom created by jigdo and I verified myself the iso image with md5sum and sha1sums. The only different thing I did from previous installations is that this time I choose Graphic Installation. # apt-cache policy aptitude (shows the next result): aptitude: Installed: (none) Candidate: 0.8.7-1 Version table: 0.8.7-1 500 500 cdrom://[Debian GNU/Linux 9.3.0 _Stretch_ - Official amd64 DVD Binary-1 20171209-12:11] stretch/main amd64 Packages 500 http://ftp.mx.debian.org/debian stretch/main amd64 Packages Regards to everyone and thanks again Oscar Corte