I have installed Ubuntu 16.04 on family member PC (it was the only choice, Ubuntu and Win10), but i hope someone give me some tip how i can fix this since its similiar to Debian.
Basically this PC came with Window 10 preinstalled, i tested it and 4k video on Youtube was working great, but on Ubuntu 16.04 and 17.10, the video is lagging like hell.
IF i play 4k video in VLC, it basically freezes at one frame and only plays sound.
I tested it on Gnome 3.26 , Unity and Openbox.
Any idea what i could try?Intel Apollo Lake N3450
Intel HD Graphics 500