Strange screen

Hello,
I installed lubuntu 16.04.3 LTS on a Acer Aspire One D250.
No problem but after update and reboot I get this screen :

The problem is not visible when I make a screenshot.
But if I suspend and get back, the problem disappears.
I tried to restart the graphical server, i installed the Intel graphics drivers, i updated the bios, and tried with Ubuntu and Xubuntu, but get the same problem.

What do you think i cna do ?
Thanks in advance.

Ben

I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the https://community.ubuntu.com/t/finding-help/712 page.