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Yocto Linux build system (bitbake) adopts highly sophisticated override syntax using : or _ to efficiently describe what we want to do. This significantly reduce the amount of bb/bbappend code because we do not have to write explicit branching scripts at all in many cases. However, the problem is that key operator character had been changed from _ to : since a version of Yocto distribution. The conversion is available for forward distribution upgrade. But backward one is still not available in official distribution as far as I observed.

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Ubuntu 22.04にアップグレードした直後に以前までログインできていたsshログインが失敗する。これはopenssh-serverのバージョンが変わったことによる。

Permission denied (publickey).
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組み込み機器に対してSSHしたときに、イメージ焼き直した前と後で同じIPだとセキュリティの関係でknown_hostsの行を消さないといけない。