I have upgraded my Ubuntu 18.04 to 19.04 and then 19.10. Since that time I see nothing on both screens except a homogeneous black surface. On the second monitor is blinking the green LED - normally showing with continuous light the supply voltage is on - probably showing the lack of video signal.
Would be possible somehow to repair this ?
If it is impossible have I to delete the whole partition (loosing the earlier settings of ubuntu 18.04) and reinstall the old good ubuntu 18.04? Thanks in advance for your kind support.