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Fix --add-apt-source=ppa for focal

Florent 'Skia' Jacquet requested to merge ubuntu-ci-team/autopkgtest:skia/fix_ppa_on_focal into master

Two linked issues on focal:

  • First one is the Signed-By field supporting only fingerprints, not the key itself directly. This raised the following error:

    E: Invalid value set for option Signed-By regarding source https://ppa.launchpadcontent.net/ubuntu-security-proposed/ppa/ubuntu/ focal (not a fingerprint)

    This is worked around by raising the minimal apt version to unlock deb822 support to 2.3.10, which has the following in its changelog:

    Add support for embedding PGP keys into Signed-By in deb822 sources

  • When falling back to non deb822 sources for focal, apt-key starts complaining about stdout not being a terminal: Warning: apt-key output should not be parsed (stdout is not a terminal) This is worked around with the APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 environment variable.

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