Question #677215 on Yade changed:
https://answers.launchpad.net/yade/+question/677215
Status: Open => Answered
Manfred Hampl proposed the following answer:
see https://wiki.ubuntu.com/Releases
Support for Ubuntu 16.10 (codename yakkety) has ended in July 2017 and the
repositories have already been removed.
You have to upgrade to a supported release of Ubuntu, e.g. Ubuntu 18.04
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