apt policy.txt

sudo apt-cache policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://download.virtualbox.org/virtualbox/debian stretch/contrib i386 Packages
     release o=Oracle Corporation,n=stretch,l=Oracle Corporation,c=contrib,b=i386
     origin download.virtualbox.org
 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 https://repo.skype.com/deb stable/main amd64 Packages
     release o=. stable,a=stable,n=stable,l=. stable,c=main,b=amd64
     origin repo.skype.com
 500 http://security.debian.org/debian-security jessie/updates/main i386 Packages
     release v=8,o=Debian,a=oldstable,n=jessie,l=Debian-Security,c=main,b=i386
     origin security.debian.org
 500 http://security.debian.org/debian-security jessie/updates/main amd64 Packages
     release v=8,o=Debian,a=oldstable,n=jessie,l=Debian-Security,c=main,b=amd64
     origin security.debian.org
 500 https://deb.nodesource.com/node_6.x jessie/main i386 Packages
     release o=Node Source,n=jessie,l=Node Source,c=main,b=i386
     origin deb.nodesource.com
 500 https://deb.nodesource.com/node_6.x jessie/main amd64 Packages
     release o=Node Source,n=jessie,l=Node Source,c=main,b=amd64
     origin deb.nodesource.com
 500 https://packagecloud.io/github/git-lfs/debian stretch/main i386 Packages
     release v=1,o=packagecloud.io/github/git-lfs,a=stretch,n=stretch,l=git-lfs,c=main,b=i386
     origin packagecloud.io
 500 https://packagecloud.io/github/git-lfs/debian stretch/main amd64 Packages
     release v=1,o=packagecloud.io/github/git-lfs,a=stretch,n=stretch,l=git-lfs,c=main,b=amd64
     origin packagecloud.io
 999 http://binaries.erlang-solutions.com/debian stretch/contrib i386 Packages
     release o=Erlang Solutions Ltd.,n=stretch,l=Erlang Solutions Ltd.,c=contrib,b=i386
     origin binaries.erlang-solutions.com
 999 http://binaries.erlang-solutions.com/debian stretch/contrib amd64 Packages
     release o=Erlang Solutions Ltd.,n=stretch,l=Erlang Solutions Ltd.,c=contrib,b=amd64
     origin binaries.erlang-solutions.com
 500 https://apt.dockerproject.org/repo debian-jessie/main amd64 Packages
     release o=Docker,a=debian-jessie,n=debian-jessie,l=Docker APT Repository,c=main,b=amd64
     origin apt.dockerproject.org
 100 http://httpredir.debian.org/debian jessie-backports/non-free i386 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=non-free,b=i386
     origin httpredir.debian.org
 100 http://httpredir.debian.org/debian jessie-backports/non-free amd64 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=non-free,b=amd64
     origin httpredir.debian.org
 100 http://httpredir.debian.org/debian jessie-backports/contrib i386 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=contrib,b=i386
     origin httpredir.debian.org
 100 http://httpredir.debian.org/debian jessie-backports/contrib amd64 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=contrib,b=amd64
     origin httpredir.debian.org
 100 http://httpredir.debian.org/debian jessie-backports/main i386 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=main,b=i386
     origin httpredir.debian.org
 100 http://httpredir.debian.org/debian jessie-backports/main amd64 Packages
     release o=Debian Backports,a=jessie-backports,n=jessie-backports,l=Debian Backports,c=main,b=amd64
     origin httpredir.debian.org
 500 http://www.deb-multimedia.org testing/non-free i386 Packages
     release v=0.0,o=Unofficial Multimedia Packages,a=testing,n=buster,l=Unofficial Multimedia Packages,c=non-free,b=i386
     origin www.deb-multimedia.org
 500 http://www.deb-multimedia.org testing/non-free amd64 Packages
     release v=0.0,o=Unofficial Multimedia Packages,a=testing,n=buster,l=Unofficial Multimedia Packages,c=non-free,b=amd64
     origin www.deb-multimedia.org
 500 http://www.deb-multimedia.org testing/main i386 Packages
     release v=0.0,o=Unofficial Multimedia Packages,a=testing,n=buster,l=Unofficial Multimedia Packages,c=main,b=i386
     origin www.deb-multimedia.org
 500 http://www.deb-multimedia.org testing/main amd64 Packages
     release v=0.0,o=Unofficial Multimedia Packages,a=testing,n=buster,l=Unofficial Multimedia Packages,c=main,b=amd64
     origin www.deb-multimedia.org
 500 https://deb.debian.org/debian sid/non-free i386 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=non-free,b=i386
     origin deb.debian.org
 500 https://deb.debian.org/debian sid/non-free amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=non-free,b=amd64
     origin deb.debian.org
 500 https://deb.debian.org/debian sid/contrib i386 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=contrib,b=i386
     origin deb.debian.org
 500 https://deb.debian.org/debian sid/contrib amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=contrib,b=amd64
     origin deb.debian.org
 500 https://deb.debian.org/debian sid/main i386 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=i386
     origin deb.debian.org
 500 https://deb.debian.org/debian sid/main amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
     origin deb.debian.org
 500 http://ftp.uk.debian.org/debian testing/non-free i386 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=non-free,b=i386
     origin ftp.uk.debian.org
 500 http://ftp.uk.debian.org/debian testing/non-free amd64 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=non-free,b=amd64
     origin ftp.uk.debian.org
 500 http://ftp.uk.debian.org/debian testing/contrib i386 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=contrib,b=i386
     origin ftp.uk.debian.org
 500 http://ftp.uk.debian.org/debian testing/contrib amd64 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=contrib,b=amd64
     origin ftp.uk.debian.org
 500 http://ftp.uk.debian.org/debian testing/main i386 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=main,b=i386
     origin ftp.uk.debian.org
 500 http://ftp.uk.debian.org/debian testing/main amd64 Packages
     release o=Debian,a=testing,n=buster,l=Debian,c=main,b=amd64
     origin ftp.uk.debian.org
Pinned packages: