Valentin Nechayev, please don't apport-collect from different machines. If you
have an issue with different hardware, it is most helpful to file a new report
instead via a terminal:
Despite this, this appears correlated to a KDE'ism. Is the issue
reproducible if you use GNOME? One may test a live environment via
http://cdimage.ubuntu.com/daily-live/current/ to confirm.
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Spontaneous single window freezing
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