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I upgraded Ubuntu 12.10 to Ubuntu 13.04 using the Update Manager. After upgrading I've just restarted and there's a splash sreen with Kubuntu Logo. I can't login to my Ubuntu account. I had installed KDE Desktop Manager but uninstalled it before upgrading.

Help :)

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Try reinstalling lightdm:

sudo apt-get --purge remove lightdm
sudo apt-get install lightdm
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I had installed Gnome 3 and GDM 3. Should I remove it too? – Israel Gomez Apr 26 '13 at 0:47
It will probably just ask you when you install which manager you prefer to use. – Brandon Bertelsen Apr 26 '13 at 0:51
Ok I've reinstalled lightdm and then i have to reinstall AMD Drivers. Unity doesn't work just Gnome Classic. Why the GRUB entry is Kubuntu GNU/Linux? Do you know the answer? – Israel Gomez Apr 26 '13 at 1:28

I also had a similar issue with the grub menu list, and here's how I fixed it.

The file /etc/default/grub.d/50_kubuntu.cfg passes on "Kubuntu" as the name of the distribution to update-grub. If you want to change it back to Ubuntu, the fix is as simple as:

sudo rm /etc/default/grub.d/50_kubuntu.cfg

sudo update-grub

If you want to change it to something else, just edit /etc/default/grub and change the GRUB_DISTRIBUTOR line to whatever you want. Example, change:

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`


GRUB_DISTRIBUTOR="My very own Ubuntu install"
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