TexLive 2018, after installation Debian "updates" some files and breaks it

After I install the newest version of TexLive through the official installer (this one ), if I run a sudo apt-get update && sudo apt-get dist-upgrade apt-get finds a series of packages to update, related, I think, to the package tex-common. Such packages, though, aren't updated and refer to an older distribution of TeXlive from 2016. Of course this creates issues, because if I run pdflatex -v after such update I find out that pdflatex is trying to use the 2016 of TeXlive, not the 2018 one, and any document's exportation won't work. On Ubuntu I'd solve the issue with a PPA, but PPAs aren't made for Debian and in fact the TexLive's one won't work properly here. Is there a way to permanently tell Debian to not update those packages with the ones he find in the repositories? **EDIT:** The situation turned out to be different from what I explained, so my question here is totally wrong, and thus it must be ignored/deleted.