Do you happen to have your old /etc/shadow still? Perhaps from a backup?
The only root-password changing bit I'm aware of is this:
# Fix root password of '!' for vm-builder installed instances. Unrelated
# to passwd, but seems best place. /var/log/installer won't exist in
# vm-builder created images
if dpkg --compare-versions "$2" lt "1:4.1.1-1ubuntu1.1" && \
test ! -d "/var/log/installer"; then
if printf '!\0' | unix_chkpwd root nullok ; then
echo 'root:!' | chpasswd -e
fi
fi
Which disables a root password on upgrade if it is "!". But I don't
suppose that's the problem for you?
Other than that, it is of course possible that any of the plethora of
Ubuntu universe packages changes it, but it's unlikely. Frankdn, can you
please check in /var/log/dpkg.log which packages were upgraded on
November 12?
** Changed in: shadow (Ubuntu)
Sourcepackagename: sudo => shadow
** Changed in: shadow (Ubuntu)
Status: New => Incomplete
--
latrst updates changes root password 11-12/10/08
https://bugs.launchpad.net/bugs/297227
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