Thank you for your fast feedback.
I was not able to execute
dconf reset -f /org/compiz/
at tty7 because i was not able to open a shell and on tty1 i got the error
"cannot autolaunch d-bus without x11 display".
So I did the work myself as good as i could on tty1.
sudo rm -rf ~/.config/dconf/user
sudo rm -rf ~/.cache/compizconfig-1
sudo apt-get install --reinstall compiz-core compiz
After a reboot the unity desktop was working again.
Thank you guys.
I don't know if there is be a better and cleaner solution.
Your unity_support_test returns now
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GTX 970/PCIe/SSE2
OpenGL version string: 4.4.0 NVIDIA 343.22
Not software rendered: yes
Not blacklisted: yes
GLX fbconfig: yes
GLX texture from pixmap: yes
GL npot or rect textures: yes
GL vertex program: yes
GL fragment program: yes
GL vertex buffer object: yes
GL framebuffer object: yes
GL version is 1.4+: yes
Unity 3D supported: yes
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https://bugs.launchpad.net/bugs/1389888
Title:
unity not shown only desktop with new nvida 970 card
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