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preferences
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/etc/apt/sources.list
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deb http://security.debian.org/debian-security buster/updates main non-free contrib
deb http://deb.debian.org/debian buster-updates main non-free contrib
deb http://deb.debian.org/debian buster-backports main non-free contrib
deb http://deb.debian.org/debian buster-proposed-updates main non-free contrib
deb http://deb.debian.org/debian buster main non-free contrib
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/etc/apt/preferences
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Package: *
Pin: release a=buster/updates
Pin-Priority: 500
Package: *
Pin: release a=buster
Pin-Priority: 500
Package: *
Pin: release a=buster-updates
Pin-Priority: 500
Package: *
Pin: release a=buster-backports
Pin-Priority: 500
Package: *
Pin: release a=buster-proposed-updates
Pin-Priority: 500
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/etc/apt/sources.list.d
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apt update
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