apt quer instalar uma versão inexistente do docker.io

Estou tendo um problema no Debian 11 totalmente atualizado (bullseye) e esgotei meu conhecimento sobre solução de problemas sobre o assunto. Atualmente, estou executando 3 PCs, todos com configurações quase idênticas gerenciadas pelo Ansible. Um, e apenas um, desses três sistemas está lançando um erro ao tentar apt install docker.ioatravés do Ansible (como root) ou manualmente (por exemplo sudo apt install docker.io):

~ » sudo apt install docker.io
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following package was automatically installed and is no longer required:
  linux-image-5.10.0-15-amd64
Use 'sudo apt autoremove' to remove it.
The following additional packages will be installed:
  cgroupfs-mount containerd libintl-perl libintl-xs-perl libmodule-find-perl libmodule-scandeps-perl libproc-processtable-perl libsort-naturally-perl libterm-readkey-perl needrestart runc tini
Suggested packages:
  containernetworking-plugins docker-doc aufs-tools btrfs-progs debootstrap rinse rootlesskit xfsprogs zfs-fuse | zfsutils-linux needrestart-session | libnotify-bin iucode-tool
Recommended packages:
  criu
The following NEW packages will be installed:
  cgroupfs-mount containerd docker.io libintl-perl libintl-xs-perl libmodule-find-perl libmodule-scandeps-perl libproc-processtable-perl libsort-naturally-perl libterm-readkey-perl needrestart runc tini
0 upgraded, 13 newly installed, 0 to remove and 0 not upgraded.
Need to get 40.0 MB/61.4 MB of archives.
After this operation, 270 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://deb.debian.org/debian bullseye/main amd64 runc amd64 1.0.0~rc93+ds1-5+b2
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:2 http://deb.debian.org/debian bullseye/main amd64 docker.io amd64 20.10.5+dfsg1-1+deb11u1
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:3 http://deb.debian.org/debian bullseye/main amd64 libintl-perl all 1.26-3
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:4 http://deb.debian.org/debian bullseye/main amd64 libintl-xs-perl amd64 1.26-3
  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/r/runc/runc_1.0.0%7erc93%2bds1-5%2bb2_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/d/docker.io/docker.io_20.10.5%2bdfsg1-1%2bdeb11u1_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/libi/libintl-perl/libintl-perl_1.26-3_all.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/libi/libintl-perl/libintl-xs-perl_1.26-3_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

O que eu tentei

Verifiquei que estou conectado à Internet, posso me conectar a http://deb.debian.org/debian no Firefox na máquina afetada, posso atualizar as informações do pacote do Apt via sudo apt update, e posso atualizar pacotes via sudo apt upgrade.

Editar: sudo apt update retorna a seguinte saída:

~ » sudo apt update
Hit:1 http://deb.debian.org/debian bullseye InRelease
Hit:2 http://security.debian.org/debian-security bullseye-security InRelease                                           
Hit:3 http://deb.debian.org/debian bullseye-updates InRelease                                                                                 
Hit:4 http://deb.debian.org/debian bullseye-backports InRelease                                                                               
Hit:5 https://updates.signal.org/desktop/apt xenial InRelease                                                                                
Hit:6 https://packages.element.io/debian default InRelease                       
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.

Esperei pelo menos uma semana para ver se talvez houvesse um problema upstream que pudesse ser corrigido por uma atualização. Nenhuma mudança.

Eu procurei por perguntas semelhantes aqui e li as doze principais ou mais; Não vi ninguém perguntar e resolver um problema semelhante.

Eu tentei cavar em versões disponíveis via apt. A execução apt show docker.io --all-versionsem todas as três máquinas produz:

On working machine "M": 20.10.5+dfsg1-1+deb11u2
On working machine "Z": 20.10.5+dfsg1-1+deb11u2
On broken machine "T":  20.10.5+dfsg1-1+deb11u1

Já tentei instalar manualmente a versão que as máquinas M e Z possuem:

~ » sudo apt install docker.io=20.10.5+dfsg1-1+deb11u2
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Version '20.10.5+dfsg1-1+deb11u2' for 'docker.io' was not found

Já tentei usar --fix-missing. Saída completa:

~ » sudo apt install docker.io --fix-missing
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following package was automatically installed and is no longer required:
  linux-image-5.10.0-15-amd64
Use 'sudo apt autoremove' to remove it.
The following additional packages will be installed:
  cgroupfs-mount containerd libintl-perl libintl-xs-perl libmodule-find-perl
  libmodule-scandeps-perl libproc-processtable-perl libsort-naturally-perl libterm-readkey-perl
  needrestart runc tini
Suggested packages:
  containernetworking-plugins docker-doc aufs-tools btrfs-progs debootstrap rinse rootlesskit
  xfsprogs zfs-fuse | zfsutils-linux needrestart-session | libnotify-bin iucode-tool
Recommended packages:
  criu
The following NEW packages will be installed:
  cgroupfs-mount containerd docker.io libintl-perl libintl-xs-perl libmodule-find-perl
  libmodule-scandeps-perl libproc-processtable-perl libsort-naturally-perl libterm-readkey-perl
  needrestart runc tini
0 upgraded, 13 newly installed, 0 to remove and 0 not upgraded.
Need to get 40.0 MB/61.4 MB of archives.
After this operation, 270 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://deb.debian.org/debian bullseye/main amd64 runc amd64 1.0.0~rc93+ds1-5+b2
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:2 http://deb.debian.org/debian bullseye/main amd64 docker.io amd64 20.10.5+dfsg1-1+deb11u1
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:3 http://deb.debian.org/debian bullseye/main amd64 libintl-perl all 1.26-3
  404  Not Found [IP: 2a04:4e42:a::644 80]
Err:4 http://deb.debian.org/debian bullseye/main amd64 libintl-xs-perl amd64 1.26-3
  404  Not Found [IP: 2a04:4e42:a::644 80]
Selecting previously unselected package cgroupfs-mount.
(Reading database ... 199957 files and directories currently installed.)
Preparing to unpack .../0-cgroupfs-mount_1.4_all.deb ...
Unpacking cgroupfs-mount (1.4) ...
Selecting previously unselected package containerd.
Preparing to unpack .../1-containerd_1.4.13~ds1-1~deb11u2_amd64.deb ...
Unpacking containerd (1.4.13~ds1-1~deb11u2) ...
Selecting previously unselected package libmodule-find-perl.
Preparing to unpack .../2-libmodule-find-perl_0.15-1_all.deb ...
Unpacking libmodule-find-perl (0.15-1) ...
Selecting previously unselected package libmodule-scandeps-perl.
Preparing to unpack .../3-libmodule-scandeps-perl_1.30-1_all.deb ...
Unpacking libmodule-scandeps-perl (1.30-1) ...
Selecting previously unselected package libproc-processtable-perl.
Preparing to unpack .../4-libproc-processtable-perl_0.59-2+b1_amd64.deb ...
Unpacking libproc-processtable-perl (0.59-2+b1) ...
Selecting previously unselected package libsort-naturally-perl.
Preparing to unpack .../5-libsort-naturally-perl_1.03-2_all.deb ...
Unpacking libsort-naturally-perl (1.03-2) ...
Selecting previously unselected package libterm-readkey-perl.
Preparing to unpack .../6-libterm-readkey-perl_2.38-1+b2_amd64.deb ...
Unpacking libterm-readkey-perl (2.38-1+b2) ...
Selecting previously unselected package tini.
Preparing to unpack .../7-tini_0.19.0-1_amd64.deb ...
Unpacking tini (0.19.0-1) ...
Setting up libmodule-find-perl (0.15-1) ...
Setting up tini (0.19.0-1) ...
Setting up libproc-processtable-perl (0.59-2+b1) ...
Setting up cgroupfs-mount (1.4) ...
Setting up libterm-readkey-perl (2.38-1+b2) ...
dpkg: dependency problems prevent configuration of containerd:
 containerd depends on runc (>= 0.1.0~); however:
  Package runc is not installed.

dpkg: error processing package containerd (--configure):
 dependency problems - leaving unconfigured
Setting up libsort-naturally-perl (1.03-2) ...
Setting up libmodule-scandeps-perl (1.30-1) ...
Processing triggers for man-db (2.9.4-2) ...
Errors were encountered while processing:
 containerd
E: Failed to fetch http://deb.debian.org/debian/pool/main/r/runc/runc_1.0.0%7erc93%2bds1-5%2bb2_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/d/docker.io/docker.io_20.10.5%2bdfsg1-1%2bdeb11u1_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/libi/libintl-perl/libintl-perl_1.26-3_all.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/libi/libintl-perl/libintl-xs-perl_1.26-3_amd64.deb  404  Not Found [IP: 2a04:4e42:a::644 80]
E: Sub-process /usr/bin/dpkg returned an error code (1)

(O sistema é então deixado em um estado quebrado, com o Apt sugerindo que eu execute apt --fix-broken install. Isso falha, devido aos mesmos problemas. Para restaurar o sistema, tenho que executar apt remove containerde apt autoremovepara uma boa medida.)

Eu abri https://deb.debian.org/debian/pool/main/d/docker.io/ no Firefox e observei que a versão 20.10.5+dfsg1-1+deb11u1 não tem arquivos .deb. Ainda assim, não sei por que esse sistema em particular não instala +deb11u2.

Com base nesta resposta , eu executei apt-cache policy:

# Working machine M
~ » apt-cache policy docker.io
docker.io:
  Installed: 20.10.5+dfsg1-1+deb11u2
  Candidate: 20.10.5+dfsg1-1+deb11u2
  Version table:
 *** 20.10.5+dfsg1-1+deb11u2 500
        500 http://deb.debian.org/debian bullseye/main amd64 Packages
        100 /var/lib/dpkg/status

# Working machine Z
~ » apt-cache policy docker.io
docker.io:
  Installed: 20.10.5+dfsg1-1+deb11u2
  Candidate: 20.10.5+dfsg1-1+deb11u2
  Version table:
 *** 20.10.5+dfsg1-1+deb11u2 500
        500 http://deb.debian.org/debian bullseye/main amd64 Packages
        100 /var/lib/dpkg/status

# Broken machine T
~ » apt-cache policy docker.io
docker.io:
  Installed: (none)
  Candidate: 20.10.5+dfsg1-1+deb11u1
  Version table:
     20.10.5+dfsg1-1+deb11u1 500
        500 http://deb.debian.org/debian bullseye/main amd64 Packages

Isso não parece responder à pergunta, então examinei as versões disponíveis em apt-cache madison:

# Working machine M
~ » apt-cache madison docker.io
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye/main amd64 Packages
 docker.io | 20.10.5+dfsg1-1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye-backports/main Sources

# Working machine Z
~ » apt-cache madison docker.io
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye/main amd64 Packages
 docker.io | 20.10.5+dfsg1-1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye-backports/main Sources

# Broken machine T
~ » apt-cache madison docker.io
 docker.io | 20.10.5+dfsg1-1+deb11u1 | http://deb.debian.org/debian bullseye/main amd64 Packages
 docker.io | 20.10.5+dfsg1-1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u1 | http://deb.debian.org/debian bullseye/main Sources
 docker.io | 20.10.5+dfsg1-1+deb11u2 | http://deb.debian.org/debian bullseye-backports/main Sources

As diferenças que estou notando na saída do madison são (a) a máquina T tem +deb11u1 em vez de +deb11u2 na linha Packages e (b) a máquina T não tem uma linha +deb11u2 Sources. Ainda não vejo por que o Apt está procurando uma versão ausente ou não oferece nenhuma das outras versões disponíveis no mesmo repositório.

Eu executei apt-cache showpkg docker.ionas máquinas T e Z e comparei as saídas cuidadosamente usando diff. Máquina quebrada T mostra:

~ » apt-cache showpkg docker.io
Package: docker.io
Versions: 
20.10.5+dfsg1-1+deb11u1 (/var/lib/apt/lists/deb.debian.org_debian_dists_bullseye_main_binary-amd64_Packages)
 Description Language: 
                 File: /var/lib/apt/lists/deb.debian.org_debian_dists_bullseye_main_binary-amd64_Packages
                  MD5: 05dc9eba68f3bf418e6a0cf29d555878
 Description Language: en
                 File: /var/lib/apt/lists/deb.debian.org_debian_dists_bullseye_main_i18n_Translation-en
                  MD5: 05dc9eba68f3bf418e6a0cf29d555878


Reverse Depends: 
  runc,docker.io 1.13.1~ds1-2
  docker-compose,docker.io 1.9.0
  lava-dispatcher,docker.io
  lava,docker.io
  containerd,docker.io 1.12
  whalebuilder,docker.io
  toil,docker.io
  subuser,docker.io
  docker-compose,docker.io 1.9.0
  ruby-docker-api,docker.io
  python3-testinfra,docker.io
  piuparts,docker.io
  packer,docker.io
  libnss-docker,docker.io
  lava-dispatcher,docker.io
  lava,docker.io
  due,docker.io
  containerd,docker.io 1.12
  docker-clean,docker.io
  docker-clean,docker.io
  debocker,docker.io
  datalad-container,docker.io
  cwltool,docker.io
  amazon-ecr-credential-helper,docker.io
  charliecloud-builders,docker.io
  amazon-ecr-credential-helper,docker.io
Dependencies: 
20.10.5+dfsg1-1+deb11u1 - init-system-helpers (2 1.54~) libc6 (2 2.4) libdevmapper1.02.1 (2 2:1.02.97) libsystemd0 (0 (null)) adduser (0 (null)) containerd (2 1.4~) iptables (0 (null)) lsb-base (0 (null)) runc (2 1.0.0~rc8~) tini (0 (null)) docker-ce (0 (null)) docker-ce-cli (0 (null)) docker-ce-rootless-extras (0 (null)) apparmor (0 (null)) ca-certificates (0 (null)) cgroupfs-mount (0 (null)) git (0 (null)) needrestart (2 3.1~) xz-utils (0 (null)) docker-doc (0 (null)) aufs-tools (0 (null)) btrfs-progs (0 (null)) debootstrap (0 (null)) e2fsprogs (0 (null)) rinse (0 (null)) rootlesskit (0 (null)) xfsprogs (0 (null)) zfs-fuse (16 (null)) zfsutils-linux (0 (null)) 
Provides: 
20.10.5+dfsg1-1+deb11u1 - 
Reverse Provides: 

Eu não postarei a saída da máquina Z aqui por questões de brevidade, mas a única diferença é que ela mostra +deb11u2 em vez de +deb11u1 em todos os 3 lugares. Também não vejo explicações nesta saída, AFAICT.

Esse é o limite do meu conhecimento de solução de problemas. O que está acontecendo e como faço para corrigir isso? Muito obrigado!