When I run update-manager I have this message:
W:Conflicting distribution: http://deb.opera.com testing Release
(expected testing but got stable),
W:Failed to fetch http://deb.opera.com/opera/dists/lenny/non-free/binaryi386Packages
404 Not Found, E:Some index files failed to download.
They have been ignored, or old ones used instead.
I have ignore this in the past since it didn't affect my daily usage of my system. Now that I want to update from 12.04 to 14.04, it wont allow me with the same error message.
I have removed Opera but it didn't seem to help
Ay idea about what would help? Thanks Nemo
deb http://deb.opera.com/opera/dists
in your/etc/apt/sources.list
file.