Please attach a screenshot or photo of the screen that shows the issue.
I gather you uninstalled -nvidia and tested that it still happens
without that?
In any case probably should be investigated as a unity issue first since
you are seeing it after updating to 5.4
** Package changed: xorg (Ubuntu) => unity (Ubuntu)
** Changed in: unity (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/938940
Title:
Large blury stripe in the middle of my screen
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