Public bug reported:

The fix:
https://anonscm.debian.org/git/pbuilder/pbuilder.git/commit/?id=bf1acdc

[Impact]

The remove_packages() function in pbuilder-modules contains:
    if (dpkg -s "$pkg" 2>&1)>/dev/null ; then
This obviously must
    if ($CHROOTEXEC dpkg -s "$pkg" 2>&1)>/dev/null ; then

This causes remove_packages() to try to remove packages that are not
present, actually making the function not working at all in some
circumstances, leading to crashes.

[Test Case]

 * get a sarge chroot, or anyway around that time
 * assuming you have pbuilder installed on the host and not in the chroot, run:
       pbuilder u --removepackages pbuilder

[Regression Potential]

 * for yakkety, no potential regression, this is a targetted fix.

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

** Affects: pbuilder (Ubuntu Yakkety)
     Importance: Undecided
         Status: New

** Affects: pbuilder (Debian)
     Importance: Unknown
         Status: Unknown

** Bug watch added: Debian Bug tracker #840146
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=840146

** Also affects: pbuilder (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=840146
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1640892

Title:
  pbuilder: remove_packages() checks for existence in host, not in
  chroot

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