Fehler beim "apt-get update" beim Erstellen eines Docker-Images

Question

Ich versuche, ein benutzerdefiniertes Docker-Image zum Ausführen von Python-Code in Ubuntu zu erstellen. Die Docker-Datei lautet wie folgt:

FROM ubuntu:latest
LABEL maintainer="NONE"
LABEL version="0.1"
LABEL description="This is custom Docker Image for "
ARG DEBIAN_FRONTEND=noninteractive
ARG --security-opt seccomp:unconfined
RUN apt-get update
RUN apt-get install software-properties-common
RUN add-apt-repository ppa:deadsnakes/ppa
RUN apt-get update
RUN apt-get install python3.8
RUN mkdir file

Wenn ich versuche, das Image mit dem folgenden Befehl zu erstellen

$ docker build -t pythontest:0.1 . 

Es kommt mit dem Fehler

Sending build context to Docker daemon  3.072kB
Step 1/12 : FROM ubuntu:latest
 ---> 3324772e8bdf
Step 2/12 : LABEL maintainer="NONE"
 ---> Using cache
 ---> f01ea4479da0
Step 3/12 : LABEL version="0.1"
 ---> Using cache
 ---> c47bd2e4db51
Step 4/12 : LABEL description="This is custom Docker Image for "
 ---> Using cache
 ---> 4d4e2eacd32d
Step 5/12 : ARG DEBIAN_FRONTEND=noninteractive
 ---> Using cache
 ---> fd189bb79348
Step 6/12 : ARG --security-opt seccomp:unconfined
 ---> Using cache
 ---> fcf86c83bf36
Step 7/12 : RUN apt-get update
 ---> Running in 3e6bc0a2f06a
Get:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease [265 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease [111 kB]
Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
  At least one invalid signature was encountered.
Get:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease [98.3 kB]
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [107 kB]
Err:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
  At least one invalid signature was encountered.
Err:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
  At least one invalid signature was encountered.
Err:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
  At least one invalid signature was encountered.
Reading package lists...
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-security InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-security InRelease' is not signed.
The command '/bin/sh -c apt-get update' returned a non-zero code: 100

Ich habe versucht, das zu tun, --security-opt seccomp:unconfinedwas ich im Internet gefunden habe, aber es funktioniert immer noch nicht. Was kann ich tun, um das Problem zu beheben? Vielen Dank, ich bin neu in Containern. Wenn ich etwas falsch mache, möchte ich mich dafür entschuldigen.

Die Docker-Version, die ich verwende, ist 19.03.8 und läuft unter Himbeer-Pi 4. Betriebssystem: Ubuntu Server 20.04

Hier wird ausgegeben von docker image inspect ubuntu:latest

    {
        "Id": "sha256:3324772e8bdf660aaf741dbcac501848ddcabfe01959f3ca8c86a2a009208bea",
        "RepoTags": [
            "ubuntu:latest"
        ],
        "RepoDigests": [
            "ubuntu@sha256:fff16eea1a8ae92867721d90c59a75652ea66d29c05294e6e2f898704bdb8cf1"
        ],
        "Parent": "",
        "Comment": "",
        "Created": "2020-10-23T18:16:30.775377487Z",
        "Container": "daa39024d37233b858422faf1f61c075e22042f4b509a2167365c47a228eac7d",
        "ContainerConfig": {
            "Hostname": "daa39024d372",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/sh",
                "-c",
                "#(nop) ",
                "CMD [\"/bin/bash\"]"
            ],
            "Image": "sha256:68f8e17ca86b7256cc7d0e8837153fc04aef3c773759b39fc85e8acea31cef03",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {}
        },
        "DockerVersion": "19.03.12",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/bash"
            ],
            "Image": "sha256:68f8e17ca86b7256cc7d0e8837153fc04aef3c773759b39fc85e8acea31cef03",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "arm",
        "Os": "linux",
        "Size": 49750525,
        "VirtualSize": 49750525,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/7a6c15236a35169104ea390778d70897604471cb88fe388d426e9feac647bef7/diff:/var/lib/docker/overlay2/6316859fe20573107ba86c5754b2ad30046257c9917e50a13a4ffa63ff0a789d/diff",
                "MergedDir": "/var/lib/docker/overlay2/22d5e265d242fa8cf87fd5c4075958ab144dbf0712717b36fc8af41cb554a7bd/merged",
                "UpperDir": "/var/lib/docker/overlay2/22d5e265d242fa8cf87fd5c4075958ab144dbf0712717b36fc8af41cb554a7bd/diff",
                "WorkDir": "/var/lib/docker/overlay2/22d5e265d242fa8cf87fd5c4075958ab144dbf0712717b36fc8af41cb554a7bd/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:1891915f38b4349f99946b899c416ff2e360ff1057fb662d6ae94a9ec7ab04f0",
                "sha256:7d1044b9450b57d7507221479ccd4607d86cb6e73a2fa20b6399642a807ff192",
                "sha256:8ec53037c94bd75359fbb42036fa28aeda1e6b11725a0ad46f0ded867b40e227"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

Answer 1

Beschneiden Sie die nicht verwendeten Bilder, um Speicherplatz freizugeben. Möglicherweise ist den Docker-Images auf Ihrem Betriebssystem der Speicherplatz ausgegangen. Das hat sich irgendwie als aptMeldung ungültiger Signaturen für Paketindexdateien herausgestellt.

docker image prune -a