oot@debian:/home/demo# apt-get updateGet:1 http://snapshot.debian.org/archive/debian-ports/20210812T100000Z sid InRelease [55.3 kB] Get:2 http://snapshot.debian.org/archive/debian-ports/20210812T100000Z unreleased InRelease [56.6 kB] Get:3 http://snapshot.debian.org/archive/debian/20210812T100000Z sid InRelease [165 kB] Err:1 http://snapshot.debian.org/archive/debian-ports/20210812T100000Z sid InRelease The following signatures were invalid: EXPKEYSIG 5A88D659DCB811BB Debian Ports Archive Automatic Signing Key (2021) <[email protected]> Err:2 http://snapshot.debian.org/archive/debian-ports/20210812T100000Z unreleased InRelease The following signatures were invalid: EXPKEYSIG 5A88D659DCB811BB Debian Ports Archive Automatic Signing Key (2021) <[email protected]> Get:4 http://snapshot.debian.org/archive/debian/20210812T100000Z sid/main Sources [9094 kB] Reading package lists... Done W: GPG error: http://snapshot.debian.org/archive/debian-ports/20210812T100000Z sid InRelease: The following signatures were invalid: EXPKEYSIG 5A88D659DCB811BB Debian Ports Archive Automatic Signing Key (2021) <[email protected]> E: The repository 'http://snapshot.debian.org/archive/debian-ports/20210812T100000Z sid InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://snapshot.debian.org/archive/debian-ports/20210812T100000Z unreleased InRelease: The following signatures were invalid: EXPKEYSIG 5A88D659DCB811BB Debian Ports Archive Automatic Signing Key (2021) <[email protected]> E: The repository 'http://snapshot.debian.org/archive/debian-ports/20210812T100000Z unreleased InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
I just downloaded debian-hurd-20210812.img, and started it in kvm.
apt-get update then failed:
- The following signatures were invalid: EXPKEYSIG 5A88... Philipp Klaus Krause
- Re: The following signatures were invalid: EXPKE... Samuel Thibault
- Re: The following signatures were invalid: EXPKE... Jeffrey Walton

