My upgrade manager went zombie a long time ago. I finally decided to do something about it. It claims that I have an invalid Internet connection when I tell him to find a best suitable server on the server list. When I choose the server by myself it simply does not find any updates. Because of that I am stuck at the 12.04 version.
My Internet connection is definitely very fine, I tried at 4 different Internet sources. So where's the bug?
PS I have already tried doing this by the command line with sudo do release upgrade and all of that. The result is similar - no updates found.
Contents of etc/apt/sources
/etc/apt/sources.list.d/ferramroberto-sopcast-oneiric.list
/etc/apt/sources.list.d/ferramroberto-sopcast-oneiric.list.distUpgrade
/etc/apt/sources.list.d/ferramroberto-sopcast-oneiric.list.save
/etc/apt/sources.list.d/google-talkplugin.list
/etc/apt/sources.list.d/google-talkplugin.list.distUpgrade
/etc/apt/sources.list.d/google-talkplugin.list.save
/etc/apt/sources.list.d/precise-partner.list
/etc/apt/sources.list.d/precise-partner.list.distUpgrade
/etc/apt/sources.list.d/precise-partner.list.save
/etc/apt/sources.list.d/ubuntu-wine-ppa-precise.list
/etc/apt/sources.list.d/ubuntu-wine-ppa-precise.list.distUpgrade
/etc/apt/sources.list.d/ubuntu-wine-ppa-precise.list.save
/etc/apt/sources.list.d/ubuntu-x-swat-x-updates-precise.list
/etc/apt/sources.list.d/ubuntu-x-swat-x-updates-precise.list.distUpgrade
/etc/apt/sources.list.d/ubuntu-x-swat-x-updates-precise.list.save
/etc/apt/sources.list