[Bug 1413915] [NEW] Trying to upgrade from kubuntu 14.10 to 15.04 a2 and crashed

[SteliosSk]

Public bug reported:

When upgrading kubuntu 14.10 to 15.04 I got the following message:
W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/source/Sources   404  Not Found
, W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/binary-amd64/Packages   404  Not Found
, W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/binary-i386/Packages   404  Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.

I am using wifi to connect to the internet. Is this the reason? Should I
try wired connection?

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1413915

Title:
  Trying to upgrade from kubuntu 14.10 to 15.04 a2 and crashed

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  When upgrading kubuntu 14.10 to 15.04 I got the following message:
  W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/source/Sources   404  Not Found
  , W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/binary-amd64/Packages   404  Not Found
  , W:Αποτυχία ανάκτησης του http://extras.ubuntu.com/ubuntu/dists/vivid/main/binary-i386/Packages   404  Not Found
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

  I am using wifi to connect to the internet. Is this the reason? Should
  I try wired connection?

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