apt list attached file "test"
------------------------
apt-cache policy nvidia-legacy-390xx-driver nvidia-legacy-390xx-driver-libs  nvidia-legacy-390xx-driver-libs-nonglvnd
nvidia-legacy-390xx-driver:
  Installed: (none)
  Candidate: 390.138-1~deb10u1
  Version table:
     390.138-1~deb10u1 500
        500 http://deb.debian.org/debian buster/non-free amd64 Packages
nvidia-legacy-390xx-driver-libs:
  Installed: (none)
  Candidate: 390.138-1~deb10u1
  Version table:
     390.138-1~deb10u1 500
        500 http://deb.debian.org/debian buster/non-free amd64 Packages
nvidia-legacy-390xx-driver-libs-nonglvnd:
  Installed: (none)
  Candidate: 390.138-1~deb10u1
  Version table:
     390.138-1~deb10u1 500
        500 http://deb.debian.org/debian buster/non-free amd64 Packages




--------------

 apt-cache policy

Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://dl.google.com/linux/chrome/deb stable/main amd64 Packages
     release v=1.0,o=Google LLC,a=stable,n=stable,l=Google,c=main,b=amd64
     origin dl.google.com
 500 http://deb.debian.org/debian buster-updates/main amd64 Packages
     release o=Debian,a=stable-updates,n=buster-updates,l=Debian,c=main,b=amd64
     origin deb.debian.org
 500 http://security.debian.org/debian-security buster/updates/main amd64 Packages
     release v=10,o=Debian,a=stable,n=buster,l=Debian-Security,c=main,b=amd64
     origin security.debian.org
 100 http://deb.debian.org/debian buster-backports/non-free amd64 Packages
     release o=Debian Backports,a=buster-backports,n=buster-backports,l=Debian Backports,c=non-free,b=amd64
     origin deb.debian.org
 100 http://deb.debian.org/debian buster-backports/contrib amd64 Packages
     release o=Debian Backports,a=buster-backports,n=buster-backports,l=Debian Backports,c=contrib,b=amd64
     origin deb.debian.org
 100 http://deb.debian.org/debian buster-backports/main amd64 Packages
     release o=Debian Backports,a=buster-backports,n=buster-backports,l=Debian Backports,c=main,b=amd64
     origin deb.debian.org
 500 http://deb.debian.org/debian buster/non-free amd64 Packages
     release v=10.7,o=Debian,a=stable,n=buster,l=Debian,c=non-free,b=amd64
     origin deb.debian.org
 500 http://deb.debian.org/debian buster/contrib amd64 Packages
     release v=10.7,o=Debian,a=stable,n=buster,l=Debian,c=contrib,b=amd64
     origin deb.debian.org
 500 http://deb.debian.org/debian buster/main amd64 Packages
     release v=10.7,o=Debian,a=stable,n=buster,l=Debian,c=main,b=amd64
     origin deb.debian.org
Pinned packages: