Public bug reported:

Binary package hint: ltsp-client-core

I was trying to update LTSP chroot so I've made `apt-get update` and `apt-get 
upgrade` inside the chroot. Upgrade failed on "linux-image" package, the output 
was:
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/ltsp-update-kernels
Cannot open ``/boot/nbi.img-2.6.22-14-386'':File exists
run-parts: /etc/kernel/postinst.d/ltsp-update-kernels exited with return code 1
Failed to process /etc/kernel/postinst.d at 
/var/lib/dpkg/info/linux-image-2.6.22-14-386.postinst line 1002.

Problem is caused by /etc/kernel/postinst.d/ltsp-update-kernels script
line 139. When the mkelfimage package is installed the script tries to
create /boot/nbi-kernel-version file. If it is a kernel update (and
kernel version didn't change) the nbi file will be already in place and
mkelfimage will return error. The same problem can occure at line 152
with netabootwrap command, but I didn't test it.

To fix it we should first create the nbi file in some temporary
directory, and then move it (mv -f) to $BOOT dir.

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

-- 
unable to update kernel inside ltsp image
https://bugs.launchpad.net/bugs/189523
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