I also did some tracing on the QEMU side of my KVM instance and was not
able to see any spurious EINVALs from the host.  Clearly there is a
timing component as replacing the HOST kernel does have an effect.  But
as noted in comment #28 as it can trigger on a bare metal install it
must be in the GUEST side.

** Changed in: linux (Ubuntu Precise)
     Assignee: Canonical Kernel Team (canonical-kernel-team) => Andy Whitcroft 
(apw)

** Changed in: linux (Ubuntu Precise)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/894768

Title:
  Installation randomly fails with: File
  "/usr/lib/ubiquity/ubiquity/install_misc.py", line 621, in copy_file
  targetfh.write(buf) IOError: [Errno 22] Invalid argument

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