oneiric was released in 2011 and support ended in 2013, so it's kind of
expected that it no longer works (and hasn't in quite some time I
guess).
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1825672
Title:
W:Impossible de récupérer http://security.ubuntu.com/ubuntu/dists
/oneiric-security/main/source/Sources 404 Not Found
