[Bug 964957] Re: Installer warns "Could not stat device /dev/mapper/hostname-root - No such file or directory", works after retry

[Sgifford]

I tried testing out the final release of Precise Pangolin, and instead
of this issue, I encountered another error with root on LVM, which I
have reported as bug #1000770.

I am not sure of a straightforward way to test out the fix in Debian's
git tree.  I am familiar with using git and compiling software, but am
not familiar enough with the installation process to know how to get the
dpkg into the installer.  Maybe I could pause the installer before
partitioning, download an updated dpkg I build, apt-get install it into
the running image, then continue with the installation?  Any tips are
appreciated.

Thanks!

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https://bugs.launchpad.net/bugs/964957

Title:
  Installer warns "Could not stat device /dev/mapper/hostname-root - No
  such file or directory", works after retry

Status in “partman-auto-lvm” package in Ubuntu:
  New

Bug description:
  When I try to install Ubuntu Precise Pangolin with my filesystems on
  LVM volumes, it gives me this warning:

    Could not stat device /dev/mapper/hostname-root - No such file or
  directory.

  If I select "Retry", everything works.

  It appears that the LVs are created, but their entries in
  "/dev/mapper" don't exist yet when the rest of the system tries to use
  them.

  After I retry, the entries do exist and so everything works.

  An easy fix seems to be adding a short delay after creating the LVs,
  so they are ready by the time other parts of the install process
  begin.

  I will attach a short video with some more information, along with the
  fix that worked for me.

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