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I've made some strange experiences ever since I upgraded from Ubuntu 16.04 to 18.04: Small vertical red lines are occuring next to (random) letters in almost every word that is displayed in any program. This is kind of annoying, since it renders a text hard to read. Changing of fonts does not help. Does anyone know what might cause this problem and could give me a hint regarding a possible solution?

I would highly appreciate that.

Red vertical lines next to letters

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    What driver are you using for the videocard? You might get better results switching to or from the open source from the proprietary version. If that is possible What make/model is it?
    – Rinzwind
    Jun 6, 2018 at 9:47
  • It's a Lenovo Ideapad 500s-14isk with low specs, i.e. Intel® Core™ i3-6100U CPU @ 2.30GHz × 4, Intel® HD Graphics 520 (Skylake GT2) and 3 GB DDR3. As for the drive the Ubuntu installation came with i915, which seems to be proprietary. I am not aware of other drivers, but I would be thankful if you could name me some :)
    – Ralle Kalle
    Jun 6, 2018 at 11:33
  • @Rinzwind: Thank you for your suggestion. I added a PPA according to this post askubuntu.com/questions/87090/… and this resolved my problem.
    – Ralle Kalle
    Jun 6, 2018 at 13:57
  • Cool! Please answer you own question :) and accept it when the grace period has passed.
    – Rinzwind
    Jun 6, 2018 at 13:59

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I followed the advice of Rinzwind and tried alternative drivers according to this thread:

https://askubuntu.com/a/87094/837925

As for me, this resolved my problem.

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