Looking at your log, it looks like you made one of the scripts immutable
or otherwise blocked write access to it.
You may want to try sudo chattr -i /etc/init/network-
interface/security.conf to clear that flag, then retry the upgrade.
** Changed in: ifupdown (Ubuntu)
Status: New =
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https://bugs.launchpad.net/bugs/1014629
Title:
package ifupdown 0.6.8ubuntu29.2 failed to install/upgrade:
ErrorMessage: subprocess new pre-installation script returned error
exit
** Attachment removed: VarLogDistupgradeAptclonesystemstatetargz.gz
https://bugs.launchpad.net/bugs/1014629/+attachment/3194610/+files/VarLogDistupgradeAptclonesystemstatetargz.gz
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