I don't think this is much related to unity, since I experienced this
also in older versions of ubuntu (this problem has always been there
ihmo).
When the window is minimized, sometimes doesn't get mapped again, and
this is not possible also using other window managers (or tool such as
libwnck).
** Changed in: unity
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1389573
Title:
Update-notifier window invisible in utopic
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A second restart did clear it, so it may be a race in some kind of
display layer management somewhere, or something to that effect.
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https://bugs.launchpad.net/bugs/1389573
Title:
Updat
I have seen this problem here as well. As the code in update-notifier
hasn't changed, I think this is probably a bug in unity, refusing to
display the window.
** Package changed: update-notifier (Ubuntu) => unity (Ubuntu)
** Changed in: unity (Ubuntu)
Status: New => Confirmed
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You rec