I found this monitor and a line was on there it started out pink then it went to blue and now it is changing depending on what is shown on the screen it even goes away completely on some colors. This does not bother my work but it changes colors also when I tilt the monitor and I know it is not a computer problem, I have multiple computers and it shows up when the computer is not connected. I also use ubuntu, any answers? I added some pictures here: https://photos.app.goo.gl/RDfxSHNaw4gpFWid6