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Sometimes the dock and top bar do not appear. What to do?

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I usually just Ctrl+Alt+F2 login to command line and reboot. It then goes away.

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I was also having this problem intermittently, but it was due to a different bug and this fix solved it for me:

sudo mv /etc/xdg/autostart/at-spi-dbus-bus.desktop /etc/xdg/autostart/at-spi-dbus-bus.disabled
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If you have an Intel Graphics card that's a known bug and it should be solved by now. Try updating your system (open AppCentre, go to Updates and press Update All).

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Still happening randomly at boot.

A solution faster than rebooting is to switch to another console and restart lightdm with sudo service lightdm restart

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Do you have a logitech wireless mouse or keyboard?

If so, Try unplugging the receiver and see if the wingpanel comes back

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