Hi all, I figured out how to do this with modern apt from forky: Remove all non-Debian apt sources to avoid apt bug #1106576 Remove the non-free-firmware component from your apt sources, otherwise apt will warn about it being missing. Remove or disable appstream, otherwise apt will error out. Download the defibrillator key and add it to Signed-By in your apt sources, or set Dir::Etc::Trusted to the directory it is in. https://defi.43-1.org/defibrillator-test-key.asc Add lines to /etc/apt/apt.conf.d/90snapshot-defibrillator like this: Acquire::Snapshots::URI::Override::Label::Debian "https://defi.43-1.org/debian-defi-snapshot/debian/@SNAPSHOTID@/";; Acquire::Snapshots::URI::Override::Label::Debian-Security "https://defi.43-1.org/debian-defi-snapshot/debian-security/@SNAPSHOTID@/";; Acquire::Snapshots::URI::Override::Label::Debian-Backports "https://defi.43-1.org/debian-defi-snapshot/debian-backports/SNAPSHOTID@/";; Then this command will work without any signature errors: sudo apt install --update --snapshot 20200401T154401Z ... -- bye, pabs https://wiki.debian.org/PaulWise
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