I tried to upgrade ubuntu with do-release-upgrade
command. It started downloading for hours and some errors occured at the end. I tried again another day ,it started downloading more files but no success .
Now it's not updating anymore and prompts this message : No new release found
but my ubuntu version is 13.04 : Release: 13.04
I installed KDE and Gnome shell on ubuntu and now I'm using KDE
sources.list
file and replaceraring
withsaucy
. To do this automatically, see this answer – warvariuc Dec 12 '13 at 07:28