By default ubuntu use deadline diso io scheduler.
It seams that changinq disk scheduler from deadline to cfq solves the problem.
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https://bugs.launchpad.net/bugs/1370953
+1 16.04.1 LTS 64 bit
Same as @chobit said.
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https://bugs.launchpad.net/bugs/1244548
Title:
Keyboard shortcut for changing keyboard layout does not work