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[De zhang <question622061@xxxxxxxxxxxxxxxxxxxxx>]

New question #622061 on Yade:
https://answers.launchpad.net/yade/+question/622061

dear sir!
when I update the software, the warning as following:

W:The repository 'http://ppa.launchpad.net/yade-users/external/ubuntu xenial Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., E:Failed to fetch http://ppa.launchpad.net/yade-users/external/ubuntu/dists/xenial/main/source/Sources  404  Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.

what's the problem of this and how to solve it?
 
thanks~


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