apt policy
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://download.virtualbox.org/virtualbox/debian stretch/contrib amd64 Packages
release o=Oracle Corporation,n=stretch,l=Oracle Corporation,c=contrib,b=amd64
origin download.virtualbox.org
500 http://packages.siduction.org/fixes unstable/contrib amd64 Packages
release o=Siduction,a=unstable,n=unstable,c=contrib,b=amd64
origin packages.siduction.org
500 http://packages.siduction.org/fixes unstable/main amd64 Packages
release o=Siduction,a=unstable,n=unstable,c=main,b=amd64
origin packages.siduction.org
500 http://packages.siduction.org/extra unstable/main amd64 Packages
release o=Siduction,n=unstable,c=main,b=amd64
origin packages.siduction.org
500 http://ftp.uni-stuttgart.de/siduction/fixes unstable/contrib amd64 Packages
release o=Siduction,a=unstable,n=unstable,c=contrib,b=amd64
origin ftp.uni-stuttgart.de
500 http://ftp.uni-stuttgart.de/siduction/fixes unstable/main amd64 Packages
release o=Siduction,a=unstable,n=unstable,c=main,b=amd64
origin ftp.uni-stuttgart.de
1 http://ftp.uni-stuttgart.de/siduction/extra experimental/non-free amd64 Packages
release o=Siduction,n=experimental,c=non-free,b=amd64
origin ftp.uni-stuttgart.de
500 http://ftp.uni-stuttgart.de/siduction/extra unstable/main amd64 Packages
release o=Siduction,n=unstable,c=main,b=amd64
origin ftp.uni-stuttgart.de
500 https://deb.opera.com/opera-stable stable/non-free amd64 Packages
release o=Opera Software AS,a=stable,n=stable,l=The Opera web browser,c=non-free,b=amd64
origin deb.opera.com
500 https://download.videolan.org/pub/debian/stable Packages
release o=videolan,a=stable,n=stable,l=videolan,c=
origin download.videolan.org
1 http://packages.siduction.org/extra experimental/non-free amd64 Packages
release o=Siduction,n=experimental,c=non-free,b=amd64
origin packages.siduction.org
1 http://packages.siduction.org/extra experimental/contrib amd64 Packages
release o=Siduction,n=experimental,c=contrib,b=amd64
origin packages.siduction.org
1 http://packages.siduction.org/extra experimental/main amd64 Packages
release o=Siduction,n=experimental,c=main,b=amd64
origin packages.siduction.org
1 http://deb.debian.org/debian experimental/non-free amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=non-free,b=amd64
origin deb.debian.org
1 http://deb.debian.org/debian experimental/contrib amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=contrib,b=amd64
origin deb.debian.org
1 http://deb.debian.org/debian experimental/main amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
origin deb.debian.org
1 http://httpredir.debian.org/debian experimental/main amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
origin httpredir.debian.org
1 http://httpredir.debian.org/debian experimental/contrib amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=contrib,b=amd64
origin httpredir.debian.org
1 http://httpredir.debian.org/debian experimental/non-free amd64 Packages
release o=Debian,a=experimental,n=experimental,l=Debian,c=non-free,b=amd64
origin httpredir.debian.org
500 http://httpredir.debian.org/debian unstable/non-free amd64 Packages
release o=Debian,a=unstable,n=sid,l=Debian,c=non-free,b=amd64
origin httpredir.debian.org
500 http://httpredir.debian.org/debian unstable/contrib amd64 Packages
release o=Debian,a=unstable,n=sid,l=Debian,c=contrib,b=amd64
origin httpredir.debian.org
500 http://httpredir.debian.org/debian unstable/main amd64 Packages
release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
origin httpredir.debian.org
Pinned packages:
nvidia-driver -> 415.25-0.siduction.2 with priority -30000
nvidia-driver -> 410.93-1 with priority -30000
nvidia-driver -> 390.87-6 with priority -30000
glx-diversions -> 0.9.0 with priority -30000
xserver-xorg-video-nvidia -> 415.25-0.siduction.2 with priority -30000
xserver-xorg-video-nvidia -> 410.93-1 with priority -30000
xserver-xorg-video-nvidia -> 390.87-6 with priority -30000
The latter part looks strange as i don't remember pinning any packages let alone anything to do with nvidia.
I'll be back soon with the output of dpkg --list nvidia* as I can only use one and the same machine for the tests. Thanks again piper.