FATAL: While performing build: packer failed to pack: while unpacking tmpfs: error unpacking rootfs: unpack rootfs: config blob is not correct mediatype application/vnd.oci.image.config.v1+json: application/vnd.docker.container.image.v1+json

[MilowB]

I am using the following .def file to build my container:

Bootstrap: docker
From: ubuntu:latest

%runscript
exec python3 src/main.py --platform platforms/small_platform.xml

%post
apt-get update && apt-get -y install python3 git wget
apt -y install python3-pip
apt -y install python3-simgrid
pip install tensorflow
python3 -m pip install --upgrade Pillow

It worked fine for several weeks until I had to add a lib in the file and build the container again.
Now, when I singularity build this file, the output shows:

INFO:    Starting build...
Getting image source signatures
Copying blob 677076032cca skipped: already exists  
Copying config 58db3edaf2 done  
Writing manifest to image destination
Storing signatures
2023/02/01 12:44:25  info verified reader: 2299 bytes of trailing data discarded from vrdr[/tmp/bundle-temp-2160118556/blobs/sha256/58db3edaf2be6e80f628796355b1bdeaf8bea1692b402f48b7e7b8d1ff100b02]
FATAL:   While performing build: packer failed to pack: while unpacking tmpfs: error unpacking rootfs: unpack rootfs: config blob is not correct mediatype application/vnd.oci.image.config.v1+json: application/vnd.docker.container.image.v1+json

I noticed that this error can be avoided by using ubuntu:16.04 instead of ubuntu:latest.
Any idea where the error comes from ? And maybe how I can fix it ?

[dtrudg]

The maintainers of the official ubuntu docker hub images recently made a change to how they are built, which breaks pulling them from various container tools, other than docker.

They are planning to revert this change, or put in place a fix. New images should be in place later today.

See: docker-library/official-images#13950 (comment)

[cjdcordeiro]

This should fix it docker-library/official-images#13988 ;)