We came across a similar issue, might be the same.
Our installer (di-live) uses debconf to interact with the user, which in
turn uses the available debconf frontend, which happens to be whiptail
(ie. newt).
When the key combination ALT + *anykey* (not only tab) is pressed, whiptail
will exit with code 255.
This is easily reproducable at the prompt:
$ whiptail --yesno test 20 50; echo $?
press ALT + *anykey*
BTW - the same issue is present in dialog, so the problem is probably
not in newt itself...
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Alt + Tab freezes progress bar
https://bugs.launchpad.net/bugs/47643
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