I'm running Kubuntu 14.04 32bit. trying to upgrade I used kubuntu-devel-release-upgrade, it started work fine, but while it was downloading it was interrupted several times but starting from the cumulative percent of downloaded data, except for the last time that I left from one day to the next. Kubuntu seems to be updated and update-manager does not find any update. It is like if the system is running 16.04. What happened?