I think it is a good idea to make a decision how to handle this for
lucid release.
Every LTS upgrader with a customized keyboardmapping will run in big
trouble - every!
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Up arrow key mapped to Print [screen]
https://bugs.launchpad.net/bugs/255008
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I've marked Bug #512622, filed myself, as duplcate of this bug. It is
describing the wiredness mentioned in Bug #254939 which I also marked
as duplcate. I'm aware it does so in a confusing manner.
Lucid Lynx is also affected.
In the essence my search which also led me here, ends up to following: