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Re:Introducing Vector: Netflix's On-Host Performance Monitor... by justizin on Wednesday April 08, 2015 @06:17PM (#9344464)
Ubuntu's maintainers can check the MD5SUM file on ftp.pcp.io:

  ftp://ftp.pcp.io/projects/pcp/download/MD5SUM
The project seems to be hosted by Red Hat these days.
Re:Introducing Vector: Netflix's On-Host Performance Monitor... by willglynn on Wednesday April 08, 2015 @08:08PM (#9345016)
FTP is just as unauthenticated as everything else above, so having MD5SUMs available over FTP doesn't really change the situation.