I also had these kernel panics after installing the 2018-001 security update on Sierra (10.12.6). Thanks to this thread I was able to get the system back on its feet by upgrading Lilu to the new version that has been mentioned already (1.2.1). My system was on version 1.1.4 of Lilu before. Learn how to update the software on your Mac and how to allow important background. Security Update 2018-001 Swift 4.1.1 for Ubuntu 14.04. Apple security updates.

I initiated the installation of the latest security update for High Sierra. It all went normally. I then went back to the App Store Updates section to check it and there was no indication that I had completed the installation. The update/install option was still there as if I hadn't installed it at all. I thought that was odd, so I rebooted the Mac. I got a grey screen with a huge number of crash report log entries. There was a dialogue box option giving me a restart/shut down option. I shut down the Mac and rebooted with the same result: the O/S wouldn't boot. I spoke with a senior Apple tech. rep. He told me to reboot using Recovery mode (Command+R). I got the desktop showing, but everything was extremely slow. He did a screen share to observe how the software was acting. He concluded that there was a corrupt file and I'd have to do a complete reinstall. I had a bootable backup and three hours later, I had copied that to my Mac and successfully cloned it. (using Super Duper) No boot/performance issues now, but I'd like to know if anyone else had an issue with the install of this Security Update. It's now there in my Update section and obviously I'm hesitant to try it again. Any insights would be appreciated. It's the first time in 20 years as a Mac user that I've had such a complete software failure.

MacBook Pro Retina (2015 and later)

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Performing an Avira manual update. Although automatic updating is the best way to stay protected, you can update Avira antivirus manually anytime. For Windows users, the easiest way is to right-click the Avira icon in the taskbar and select Start update. You can also use our free Avira update tool to perform an Avira manual update. This document describes the security content of macOS Mojave 10.14.1, Security Update 2018-002 High Sierra, Security Update 2018-005 Sierra. About Apple security updates For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. About the security content of Security Update 2018-001 Swift 4.1.1 for Ubuntu 14.04 This document describes the security content of Security Update 2018-001 Swift 4.1.1 for Ubuntu 14.04.

Because Avira updates its detection files silently and automatically, most of our users never need install their own virus definition updates (VDF).
Performing an Avira manual update is only necessary under special circumstances, e.g., initiating an Avira VDF update without an internet connection.

Performing an Avira manual update

Although automatic updating is the best way to stay protected, you can update Avira antivirus manually anytime. For Windows users, the easiest way is to right-click the Avira icon in the taskbar and select Start update.
You can also use our free Avira update tool to perform an Avira manual update. This utility creates an archive (fuse bundle) containing the latest engine, the Avira VDF update files and the corresponding Avira antivirus update control files (info.gz).

Virus signature information
The names of all viruses added to the each Avira VDF update file (IVDF) are available on the VDF History page.

Why use the Avira update free tool?

The Avira manual update tool, also known as the Fusebundle Generator, allows you to create an entire antivirus update archive incrementally. In other words, you no longer have to download an entire archive for each engine and signature update.

Download the Avira Update Tool

Looking for the latest Avira software version?

Mac Security Manual Update 2018 Free

Head over to our download section, where you’ll find the most recent versions of our products. There you can not only download Avira antivirus update files for home and business, but also find management utilities, repair tools and complete product documentation.

Go to the Avira Download Center Mac Security Manual Update 2018

To update Avira manually using the Fusebundle Generator, simply follow the steps outlined below.
Please see the how-to (PDF) for detailed information on configuring and using the Avira antivirus update tool.

The Avira update free tool (also known as the Fusebundle Generator) can be found here.
Decompress avira_fusebundlegen-win32-en.zip and open the avira_fusebundlegen-win32-en folder.
Double click on fusebundle.exe and wait for the fuse bundle archive (the Avira VDF update, engine and control files) to be generated. A new Install folder will also be created; this is where you can save vdf_fusebundle.zip.
Open the Avira product, click Update from the top menu and select Manual Update.
In the popup window, navigate to the Install folder and open the vdf_fusebundle.zip archive.
All existing detection files will be replaced, even if they are newer than those in the generated archive. A progress bar will indicate the status of your Avira antivirus update.

Performing Avira VDF updates on Unix

Security Officer Manual

Before you update Avira manually using the Fusebundle Generator, please make sure that the old files are moved into a backup directory. If you don’t move the files and simply overwrite them with the new Avira update files, the product might behave strangely or even malfunction. Once the old files are set aside, unpack the archive and the restart or reload the product.