gnome lost

[mzmk]

I am using linux debian and for some purpose I have added the "unstable" distribution to sources.list

I have made an upgrade (apt-get upgrade) which worked but with some error messages.

Then to meet some dependency I install x11-common I had many such errors, then I removed the "testing" and replaced it with "testing" I have completed the installation of x11-common with
apt-get install x11-common --Fix-missing

After rebooting gnome is no longer installed and when I use
apt-get install gnome
I get a dependency problem.
The same has occured with KDE, and many other software (Openoffice, Bluefish,..)

Do I have to remove all the "testing" packages??
Can someone help?

[Vergil83]

it is best not to mix packages. I say either use testing or unstable