Comment 7 for bug 1195710

So this appears to happen on installations (i386 and amd64) only during multi-lvm installations. i.e.
d-i partman-auto/choose_recipe \
       select Separate /home, /usr, /var, and /tmp partitions
Tried a number of runs of single lvm tests but could not see the issue there and other server installations.
 "d-i partman-auto/choose_recipe select All files in one partition (recommended for new users)" is the relevant preseed entry in single lvm test installations.

One other difference I notice in between two preseeds is that in multi-lvm(where the bug is) I see the following entry
d-i base-installer/kernel/override-image string linux-generic-pae
as opposed to that in simple lvm (where the failure does not occur)
d-i base-installer/kernel/override-image string linux-server

Incidentally I notice that this linux-generic-pae is only present in the failing multi-lvm preseeds. No other server tests use this preseed and they seem to be working fine. Curious if that's any reason.