Trying to upgrade from kubuntu 14.10 to 15.04 a2 and crashed

Bug #1413915 reported by SteliosSk
This bug report is a duplicate of:  Bug #1409555: drop extras.ubuntu.com. Edit Remove
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ubuntu-release-upgrader (Ubuntu)
New
Undecided
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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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