So, after many and many nights spent trying to fix this, i've came to the very last option: ask here. Let me explain my problem. I have an ASUS NT7000something laptop, witch has only an HDMI output. I managed to install Ubntu 16.10 last year, after a lot of trouble because of my graphic card (NVIDIA GeForce 950 M). I used an HDMI to VGA adapter a couple of times to plug in an external monitor and it was always working fine (the same as using an HDMI monitor and an HDMI-HDMI cable). Then I updated to 17.04, and the trouble started. Using the HDMI port to connect a standard HDMI monitor still works fine, but if I tried to use an HDMI to VGA adapter nothing works anymore. I tried using different monitors, different cables and also different adapters, but nothing seems to work. Any kid of monitor won't be detected, at all. I tried to change and to update the NVIDIA drivers, also to use noveau and nomodeset but nothing. I tried deleting X10 and similar and it only made it worst. I even reinstalled completely Ubuntu after formatting my SSD, out of desperation! :(
Could it be that both the adapters I tried aren't compatible with Ubuntu? Is that even a thing??
Please help me!!! I would be eternally grateful!