Have the same problem.
Looks like a gnome-network-manager bug.
bpowell's tip to use WICD insteda works very good.
no more wifi instability...
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https://bugs.launchpad.net/bugs/525902
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package hotkey-setup 0.1-23ubuntu10 failed to install/upgrade: subprocess
post-installation script returned error exit status 2
https://bugs.launchpad.net/bugs/356157
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