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 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/938940 Title: Large blury stripe in the middle of my screen To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/938940/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp