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

[Olek Wojnar]

Or, to make things even easier, there's a one-line patch to fix this bug
in the Debian bug thread:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=788580#12

Long-term we should probably import the updated Debian package because
that's The Right Thing To Do, but I can confirm that the above one-liner
resolves this bug in Ubuntu.

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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:
  Unknown

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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