This bug was fixed in the package initramfs-tools - 0.92bubuntu1
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initramfs-tools (0.92bubuntu1) intrepid; urgency=low
* Merge from debian unstable, remaining changes:
- Change Build-Depends to Build-Depends-Indep.
- Use busybox-initramfs for Depends.
- Do not source
This can be easily reproduced by having files or directories that
contain spaces in "/"
The sequence of the problem is below:
In /usr/sbin/mkinitramfs:
87 # Check that we're using a new enough kernel version, first for ourselves,
88 # then for each of the hooks, which can have a MINKVER variab