Looks like you added a ppa once for kokoto-java and that ppa no longer exists, or at least doesn't have any packages/release information for Ubuntu Yakkety. You can figure out what you installed from that PPA via the Ubuntu Software Centre: https://askubuntu.com/questions/5976/how-can-i-list-all-packages-ive-installed-from-a-particular-repository
If you haven't installed anything, or don't care about the software you did install (in which case you can uninstall it to be safer), you can remove that ppa ( https://askubuntu.com/questions/307/how-can-ppas-be-removed ) and upgrade just fine. In fact, usually the GUI updater disables PPAs anyway, so you'll just be doing that step yourself manually. On Wed, 19 Apr 2017 at 10:21 Terry Coles <d-...@hadrian-way.co.uk> wrote: > On Wednesday, 19 April 2017 10:16:02 BST you wrote: > > Hi, > > > > My copy of Kubuntu 16.10 (and earlier versions) has always had an issue > with > > the graphical update tool (it never notices that there are any). This > is a > > known bug which the Kubuntu team seem unable to fix (they did once then > > changed the updater and broke it again). > > > > As a result of this, I have been in the habit of running the 'sudo > apt-get > > update' / 'sudo apt- get distro-upgrade' combo on a routine basis. Since > > 17.04 was released I get the following at the end of the apt-get update > > stage of the process: > > > > Reading package lists... Done > > > > I've searched the Kubuntu Forums and found nothing. Has anyone else seen > > this? What does it mean? > > > > I'm loathe to go for a full upgrade while I'm getting this message. > > > Hmmmm. What happened to the messages. Second try. > > Reading package lists... Done > W: The repository ' > http://ppa.launchpad.net/kokoto-java/omgubuntu-stuff/ubuntu > yakkety Release' does not have a Release file. > N: Data from such a repository can't be authenticated and is therefore > potentially dangerous to use. > N: See apt-secure(8) manpage for repository creation and user configuration > details. > E: Failed to fetch http://ppa.launchpad.net/kokoto-java/omgubuntu-stuff/ > ubuntu/dists/yakkety/main/binary-amd64/Packages > <http://ppa.launchpad.net/kokoto-java/omgubuntu-stuff/ubuntu/dists/yakkety/main/binary-amd64/Packages> > 404 Not Found > E: Some index files failed to download. They have been ignored, or old ones > used instead. > > -- > > > > Terry Coles > > -- > Next meeting: Bournemouth, Tuesday, 2017-05-02 20:00 > Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ > New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING > Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR > -- Next meeting: Bournemouth, Tuesday, 2017-05-02 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR
