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

[Scott Howard]

Public bug reported:

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
...

** Affects: pbuilder (Ubuntu)
     Importance: Wishlist
         Status: New

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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:
  New

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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