Scaphandre docker image uses deprecated ubuntu version which prevents update

[demeringo]

Bug description

hubblo/scaphandre container image is based on ubuntu 20.10 (a non LTS and now unsupported version).

Following deprecation of the ubuntu repositories, I cannot install additional software in the container.

apt update from inside the container returns

E: The repository 'http://archive.ubuntu.com/ubuntu groovy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

or local docker build (docker build .) fails for similar reason.

To Reproduce

1. sudo docker run -it --entrypoint /bin/sh hubblo/scaphandre:latest
2. inside container cat /etc/issue returns Ubuntu 20.10 \n \l
3. inside container apt update returns errors:

Ign:1 http://archive.ubuntu.com/ubuntu groovy InRelease
Ign:2 http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Ign:3 http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Err:4 http://archive.ubuntu.com/ubuntu groovy Release
  404  Not Found [IP: 91.189.88.142 80]
Err:5 http://archive.ubuntu.com/ubuntu groovy-updates Release
  404  Not Found [IP: 91.189.88.142 80]
Err:6 http://archive.ubuntu.com/ubuntu groovy-backports Release
  404  Not Found [IP: 91.189.88.142 80]
Ign:7 http://security.ubuntu.com/ubuntu groovy-security InRelease
Err:8 http://security.ubuntu.com/ubuntu groovy-security Release
  404  Not Found [IP: 91.189.91.39 80]
Reading package lists... Done
E: The repository 'http://archive.ubuntu.com/ubuntu groovy Release' does not have a Release file.
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.
E: The repository 'http://archive.ubuntu.com/ubuntu groovy-updates Release' does not have a Release file.
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.
E: The repository 'http://archive.ubuntu.com/ubuntu groovy-backports Release' does not have a Release file.
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.
E: The repository 'http://security.ubuntu.com/ubuntu groovy-security Release' does not have a Release file.
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.

Expected behavior

Update Dockerfile (line 27) to use a supported Ubuntu version, either:

• an older LTS version (20.04)
• latest interim release (21.10)

Rebuid and publish updated image to docker hub as hubblo/scaphandre:latest

Screenshots

N/A

Environment

N/A

Additional context

[bpetit]

Your fix to run on 20.04 seems like the best choice. Thanks for that !

[demeringo]

hi @bpetit

• should I close this issue now, on the rationale that the PR has been merged to dev ?
  or
• should we rather close it only after this has been integrated to next release ?

And a related question is: when should we republish the docker image ?

This last question of managing the update of the docker image is also linked to #152 opened by @rossf7 (it would add the ability to automate the publication of not-yet-stable (dev-based) images in addition to the stable releases).
=> it may be easier to integrate #152 first.

[bpetit]

I'll close it now, the release is close.

Having tagged versions according to git tags (ie releases), on one side, and a :dev image that's close to the latest code in dev, is fine for me.