Please test the packages on
http://www.linux-foundation.org/~till/tmp/ubuntu/feisty/hplip/binary/
They are on their way into Feisty.
** Changed in: hplip (Ubuntu)
Status: Confirmed => Fix Committed
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[Feisty] Clicking on HPLIP Toolbox in gnome menu does nothing
https://launchpad.net/bugs/86893