Check number of pending security updates in Ubuntu

Let me start by saying I have been forbidden to enable automatic updates on our Ubuntu servers, for both security and regular packages.

When I log into any of my four Ubuntu servers, the welcome message contains this:

39 packages can be updated.
26 updates are security updates.

However, when I run the Nagios plugin that monitors APT, I get:

% /usr/lib/nagios/plugins/check_apt
APT WARNING: 33 packages available for upgrade (0 critical updates). 

I need to know how to properly detect that there are pending security updates, and regular updates. Once I can do that, I plan to write a Nagios script that will return WARNING for pending regular updates, and CRITICAL for pending security updates.

Anyone know how to detect those two conditions?

The Nagios plugin /usr/lib/nagios/plugins/check_apt does not detect critical updates in Ubuntu correctly due how it detects critical updates via apt combined with how Ubuntu non-critical updates are published. More details are in the bug here: https://bugs.launchpad.net/bugs/1031680

Using /usr/lib/update-notifier/apt-check instead is a reliable workaround.

Turns out that the number of pending regular updates can be found using:

/usr/lib/update-notifier/apt-check 2>&1 | cut -d ';' -f 1

And the number of pending security updates can be found using:

/usr/lib/update-notifier/apt-check 2>&1 | cut -d ';' -f 2

In the end, my Nagios plugin was as follows:

#!/bin/sh
#
# Standard Nagios plugin return codes.
STATUS_OK=0
STATUS_WARNING=1
STATUS_CRITICAL=2
STATUS_UNKNOWN=3

# Query pending updates.
updates=$(/usr/lib/update-notifier/apt-check 2>&1)
if [ $? -ne 0 ]; then
    echo "Querying pending updates failed."
    exit $STATUS_UNKNOWN
fi

# Check for the case where there are no updates.
if [ "$updates" = "0;0" ]; then
    echo "All packages are up-to-date."
    exit $STATUS_OK
fi

# Check for pending security updates.
pending=$(echo "${updates}" | cut -d ";" -f 2)
if [ "$pending" != "0" ]; then
    echo "${pending} security update(s) pending."
    exit $STATUS_CRITICAL
fi

# Check for pending non-security updates.
pending=$(echo "${updates}" | cut -d ";" -f 1)
if [ "$pending" != "0" ]; then
    echo "${pending} non-security update(s) pending."
    exit $STATUS_WARNING
fi

# If we've gotten here, we did something wrong since our "0;0" check should have
# matched at the very least.
echo "Script failed, manual intervention required."
exit $STATUS_UNKNOWN