A few months ago, I found a common bug that is shared amongst all ubuntu users on thinkpad laptops. The numlock function stays 'on' and cannot be turned off via keyboard command. So, here is the fix:
Step 1:
# run the gconf-editor from a terminal window
onizo# gconf-editor
Step 2:
# in the Configuration Editor window
go to Edit -> Find and enter "numlock" in the search field. be sure to enable "Search also in key names"
Step 3:
# use the checkboxes to enable/disable features
Turn off "remember_numlock_state"
Turn off numlock "numlock_on"
That's it. no reboot required.
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