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When trying to print with a Canon iP2702 printer on Ubuntu 16.04 recently, every job was being created with a "Stopped" status. Nothing was printing and there were no error messages.

After investigating, I found the issue by expanding the job attributes for one job: (System Settings → Printer → View Print Queue → Right-click job → View Attributes)

job-printer-state-message: The PPD version (5.2.10-pre2) is not compatible with Gutenprint 5.2.11.

...which lead me to a thread that had a solution. In order to fix the issue, I had to run the following:

sudo /usr/sbin/cups-genppdupdate
sudo service cups restart

I recently installed Snort 2.9.8.3 on Ubuntu 16.04 LTS. I used the directions on the sublimerobots.com web page, which worked well aside from a couple issues described below.

Note: I had originally planned to install it on a Raspberry Pi but nothing works natively for the ARM architecture, especially Snort's Shared Object libraries, which need to be compiled differently for ARM.

Changes to Ubuntu

Newer versions of Ubuntu require some changes that aren't covered in the PDF guide on the Snort website. The web-based instructions cited above have more details.

For example, network interfaces no longer have names like eth0 on Ubuntu 16.04. This wasn't captured in the PDF guide but it was covered in the web-based instructions cited above. I also found this guide to be reliable. My default network interface is called ens2 now and it had to be changed throughout the directions.

...continue reading "Snort 2.9.8.3 on Ubuntu 16.04"

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Note: This article is outdated now. I published a new one for the latest versions of Snort (2.9.8.3) and Ubuntu (16.04). You can also probably visit sublimerobots.com for the most up-to-date information on this process.

I've been playing with Snort a lot lately. I installed it on my home network using a switch that does port mirroring. I also created a Snort virtual machine that I can use with a laptop and a network tap to diagnose other people's problems. I picked up a SharkTap Gigabit Network Tap for that. It's really just a hub though, and I had to make sure I wasn't sending any traffic back into a tapped network with it.

First I'll explain how I installed Snort at home.

Snort on Ubuntu

I used a guide on Snort's website for installation on Ubuntu 14.04 LTS. I had some issues with it, which I will describe below. Note: The author's website makes some of these corrections and may have the most recent information.

...continue reading "Snort 2.9.8.0 on Ubuntu 14.04 and VirtualBox"

I'm using a desktop that I got from System76 with an NVIDIA graphics card. Installing the NVIDIA drivers on Ubuntu wasn't simple, so here are the steps that I've gotten to work across multiple installations.

First remove any existing NVIDIA packages:

sudo apt-get remove --purge nvidia*
sudo apt-get autoremove

Next blacklist the nouveau driver. Without this step, the driver can re-appear after an update and cause problems. Create the blacklist file:

sudo vi /etc/modprobe.d/blacklist-nouveau.conf

And add the following lines:

...continue reading "NVIDIA Drivers on Ubuntu"

I wanted to create an FTP server to share some of the media that I've saved over the years. I like the old protocols and services and I plan to stand up more of them. Because each service has its own inherent security issues, the deployment process becomes an exercise in mitigating the risks. Check it out at ftp.disloops.com

I used an Ubuntu Server 14.04 LTS instance for the FTP server and gave it an AWS Elastic IP (EIP). An entry must be added to the /etc/hosts file when deploying Ubuntu instances in AWS:

127.0.0.1  (hostname here)

Without specifying the hostname, using sudo creates an error message. Next I ran updates and changed SSH to a non-default port, then installed VSFTPD and backed up the config file:

sudo apt-get update
sudo apt-get dist-upgrade
sudo vi /etc/ssh/sshd_config
sudo apt-get install vsftpd
sudo cp /etc/vsftpd.conf /etc/vsftpd.conf.old

...continue reading "Hosting Anonymous FTP"

I'm still using Ubuntu as my preferred Linux distro on personal machines. These are some of the settings that I configure each time I have to install it. Starting from the beginning:

Installation

Download the ISO image for the latest Long-Term Support (LTS) version and burn it to a disc. Boot from the disc to reach the installation menus and configure according to your needs. My own preference:

  • Plan to erase the entire disc to install Ubuntu
  • Do not download updates during installation
  • Do not encrypt the OS or home directory
  • Do not use Logical Volume Management (LVM)
  • Most importantly:
  • Do not allow automatic login
  • Do not allow login without a password

...continue reading "Secure Ubuntu 14.04 Configuration"