[Bug 922646] Re: precise alternate LVM failed to install: no root file system

[Colin Watson]

OK.  There are multiple problems here.

 1) parted has stopped probing DM devices that aren't DM-RAID.  partman-base needs it to support this.
 2) partman parses the output of 'multipath -l' to decide whether a device is a multipath device.  Foolishly, multipath prints errors to standard output, such as a complaint about dm-multipath not being loaded.
 3) dmraid-udeb depends on multipath-udeb for kpartx.  There is no kpartx-udeb.

For 1), I'm going to restore this support; it's part of parted's
interface now and shouldn't be broken.

For 2), mostly we avoid this because we only ever install multipath-udeb
in code that modprobes dm-multipath, but dmraid-udeb just broke this
assumption.  Fixing this properly seems fiddly, not least because I
can't test that I haven't broken multipath in the process, so I'm
inclined to just restore this assumption by creating kpartx-udeb and
having dmraid-udeb depend on that.

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Title:
  precise alternate LVM failed to install: no root file system

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