Ok, so the good news is that the issues are gone after an upgrade to
16.04 Beta.
I switched back to version before installing plasma 5.5.4 and then
upgraded to 16.04 Beta with
sudo ppa-purge ppa:kubuntu-ppa/backports
kubuntu-devel-release-upgrade
Everthing seems to work so far.
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You receive
Just to avoid misunderstandings - I meant I upgraded in the sense of the first
bug description - to Plasma 5.5.4 via backports.
I am still on Kubuntu 15.10.
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I just updated, because I wanted to try if there will be any problems
with 16.04 and I have the exact same problems (horizontal lines, mouse
pointer not affected).
I don't even have to log in, it also occurs if I stay on the login
screen long enough. For me it is also not possible to go to a conso
