Comment 1 for bug 1534936

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Kovid Goyal (kovid) wrote : Re: calibre bug 1534936

This is some incompatibility between Qt 5.5.1 and Ubuntu's default
window manager. It appears to only happen in Ubuntu. I cannot replicate
it in KDE, GNOME or qtile. Not much I can do about this, since it is not
a bug in calibre code. You can downgrade to the previous calibre release
which uses Qt 5.4.2 or just live with the bug until it is fixed in
Ubuntu, which will probably happen i a few months when they update the
version of Qt they ship with the OS to 5.5.1

Instructions for downgrading are ont he calibre linux download page.

 status invalid