You'll need to use 'strace -f' rather than just strace in order for the
trace to be useful.
Do you by any chance have any encrypted partitions? If so, os-prober
1.33 should fix this.
** Changed in: os-prober (Ubuntu)
Status: New => Incomplete
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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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