For some reason my top and bottom panels have disappeared. I can't right-click and add a new panel either. I tried executing gnome-panel from the terminal, rebooting, but no luck. Any idea how to recover these panels?
Ubuntu – Top and bottom panels disappeared in Ubuntu 10.10 (Gnome)
gnomegnome-panelUbuntu
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Actually, since GNOME v3.30 there is a visible option in GNOME Tweaks, which makes it much easier to enable it:
Just select "Center New Windows" under "Windows".
Actually I found a solution for GNOME without compiz. You can either use
- this extension if you have gnome-shell < v3.14
- or open dconf and set
center-new-windowsinorg.gnome.muttertotrue:
An "Input/Output Error" almost inevitably means your disk needs a fsck (or a hardware error). Check your kernel logs for sda/sdb/sdc/etc. and you will probably find some errors/warnings.
Firefox working because it is loading without the canberra-gtk-module support (libcanberra being used for playing simple sounds), but gnome-panel refuses to even run without it.
I have had a similar effect on a dual-graphics laptop, the menu bar/shortcut bar ran on one GPU while the desktop background/icons ran on the second (unity on ubuntu) and I only saw the latter, but I don't think that is your problem in this case.
Best Answer
Turns out that uninstalling Evolution also removed gnome-panel (?!?). I rebooted in recovery mode, then dropped into a netroot shell (terminal with net access) and installed gnome-panel via apt and the panels returned on the next normal boot.