Public bug reported:
I have encountered this bug on a machine which dual boots Kubuntu 9.10
(alpha 5) and Windows Vista. This caused an incomplete upgrade whereby
dpkg configuration which calls update-grub would hang after saying it
had found memtest86+, requiring an interrupt to continue. temporarily
moving the 30_os-prober script out of /etc/grub.d then re-running the
dpkg configuration resolved that.
If update-grub is called from the command line, the output pauses
similarly after memtest86+. (this is where os-prober hits the password
prompt and is actually waiting for input (it is an interactive prompt)
If user hits enter, possibly more than once, os-prober exists returning
both the correct response for Windows Vista (loader) and a spurious
'Password:'. the 30_os-prober script seems to catch this, and complain
that 'Password' is not supported by grub-mkconfig, update-grub then
finishes writing /boot/grub/grub.cfg avoiding unbootable system.
attached is a log of running strace on os-prober. the Password: prompt
appears at line 408.
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
** Tags: grub-pc memtest86+ os-prober
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os-prober spawns interactive prompt 'Password:' and causes partial hang of
/etc/grub.d/30_os-prober
https://bugs.launchpad.net/bugs/428260
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