Can't reinstall my kubuntu desktop

[romzy]

My desktop was gone: having a black font, no more bar and an only firefox tab, unabling me to use anything

I tried to reinstall kubuntu-desktop by typing :

sudo dpkg-reconfigure kubuntu-desktop
sudo apt-get install --reinstall kubuntu-desktop

But it returned me an error about packages unmeting depencies, and asked me to type something (which I also tried in the root mode after) :

apt --fix-broken install

Then I even was'nt able to enter my session : it froze after typing my password; I was able before to go in and face a black font. So I tried :

sudo apt-get purge kubuntu-desktop
sudo apt-get install kubuntu-desktop

But still the same issue..

[SeijiSensei]

Did you run "sudo apt-get update" first? You always need to do that before any updating.