vvcephei commented on pull request #10661:
URL: https://github.com/apache/kafka/pull/10661#issuecomment-876782447
Hmm, I also hit that same error today.
It seems to have been caused because the image was running Debian 9, and the
latest version of `python3` available in Debian 9 is 3.5, which only supports
pip up to version 20. I confirmed this was the issue by getting a terminal on
top of the errored image, downloading and compiling python 3.6, and running
`python3.6 -m pip install -U pip=21.1.1`.
After running `docker system prune -a`, I see it's running Debian 10:
```
root@826557ee9546:/# cat /etc/issue
Debian GNU/Linux 10 \n \l
```
Building on the recent discussion here, maybe what's happening is that we
had an older cached version of the openjdk:8 image, which limited the python
version to 3.5, which in turn make it impossible to upgrade to pip 21.
Just wanted to provide more context. I assume others will hit the same
thing. The solution is to run `docker system prune -a`.
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