The entry
# Clear PPD cache if we upgrade to 1.5.x
if dpkg --compare-versions "$2" lt-nl "1.5.0-3"; then
rm /var/cache/cups/ppds.dat 2> /dev/null || :
fi
in cups.postinst is very old. It is still from the transition from 1.4.x
to 1.5.x. Updating the original Precise with packages from precise-
proposed will never trigger this.
The entry
if dpkg --compare-versions "$2" lt-nl "1.5.3-3"; then
if ! echo $list | grep -q "\bipp14\b"; then
list=`echo $list | sed -e 's/\bipp\b/ipp,ipp14/g'`
fi
fi
would be executed all the time in Precise. It would nned to be changed
to
if dpkg --compare-versions "$2" lt-nl "1.5.3-0ubuntu2"; then
...
The impact is low. It affects only users who deactivate CUPS backends
via debconf, which in Ubuntu probably nearly no one does. If it is
executed all the time on updates, "ipp14" gets always re-activated.
"ipp14" has no bad impact on system behavior though as it does not do
any time-consuming printer search when CUPS calls it to detect printers.
Also
if dpkg --compare-versions "$2" lt "1.5.3-3"; then
modprobe usblp >/dev/null 2>&1 || :
fi
should be
if dpkg --compare-versions "$2" lt "1.5.3-0ubuntu2"; then
...
but this is harmless again. The execution loads the "usblp" kernel
module which is usually always loaded.
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https://bugs.launchpad.net/bugs/1037845
Title:
[precise-updates] Cups 1.5.0-0ubuntu2 has incorrect postinst
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