Switching to DRI3 fixes the problem for me (intel gpu).
https://www.kubuntuforums.net/showthread.php?69984-FIX-for-flickering-
flashing-panel-on-Intel-gpu
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Also affects me:
Kernel: 4.4.0-16-generic x86_64 (64 bit) Desktop: KDE Plasma 5.5.4
Distro: Ubuntu 16.04 xenial
And also affects all of my family's Ubuntu systems running on HP
Streams. This is a critical bug.
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** Attachment added: "Letters Completely Gone"
https://bugs.launchpad.net/ubuntu/+source/kubuntu-meta/+bug/1510959/+attachment/4621217/+files/Missing%20Letters1.jpg
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kubuntu-meta (Ubuntu)
Status: New => Confirmed
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