[Bug 1469735] Re: when using USEDEVPTS=yes, "Could not unmount dev/pts"

[Ubuntu Foundations Team Bug Bot]

The attachment "Patch for Debian pbuilder by Axel Beckert (note that the
Ubuntu line number is 273 not 270)" seems to be a debdiff.  The ubuntu-
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review and hopefully sponsor the debdiff.  If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1469735

Title:
  when using USEDEVPTS=yes, "Could not unmount dev/pts"

Status in pbuilder package in Ubuntu:
  Confirmed
Status in pbuilder package in Debian:
  Fix Released

Bug description:
  When using USEDEVPTS=yes, it properly mounts dev/pts when initializing the chroot
  ...
  I: mounting /dev/pts filesystem
  ...

  
  But get a warning when taking it down that it cannot unmount, says it is not mounted
  ...
  I: unmounting /home/showard/pbuilder/Raspbian-wheezy-armhf/result/ filesystem
  I: unmounting dev/pts filesystem
  W: Could not unmount dev/pts: umount: /home/showard/pbuilder/build/19785/dev/pts: not mounted
  W: Ignored error in unmount
  I: unmounting run/shm filesystem
  I: unmounting proc filesystem
  I: cleaning the build env
  ...

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