Hi,

I have installed KF5 on kubuntu using the PPA.
it works quite well on a Lenovo T420 but when choosing the Breeze window decoration the right window border is not aligned with top & bottom borders.

I notice that when running in virtualbox host, it works well.

Any Idea?

https://bugs.kde.org/show_bug.cgi?id=338210

Don't be confused because of the bug resolution, check comment #12 on why.