A member of https://lists.ubuntu.com/ told me to rename the hidden home
subdirectory .cache to xx.cache and then reboot.
It worked to me but I have lost the history of Unity sidebar and
browsers except firefox.
If it doesn't work then he said to try the same with following other
subdirectories: .config, .gnome, .gnome2, .gnome_private2, .gconf,
Finally, re-rename the subdirectories except the causing one.
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