Linux

Articles on Linux, the open source operating system

How to install MiniDLNA on Ubuntu Linux 14.04 LTS Trusty Tahr

When I was running Ubuntu Linux 12.04 LTS on my home server, I had installed minidlna as a media server that is accessible to DLNA capable clients, including a Smart TV where one can view photos on a large screen.

However, when the server was upgraded to 14.04 LTS, minidlna stopped working. Searching Google turned up forum posts from 2014 with instructions that no longer work.

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The Raspberry Pi 2 as an Internet Radio using Mopidy

Recently I got a Raspberry Pi 2, which is said to be 6 times faster than the original Raspberry Pi B. This makes it more suitable for tasks like being a media player.

Getting a full CanaKit Raspberry Pi 2 Ultimate Starter Kit adds many components for experimentation (LEDs, resistors, breadboard, 40-pin ribbon cable, ...etc.). The price was attractive since with Amazon you get free shipping, and therefore it will be cheaper than getting it directly from CanaKit.

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Installing KDE Desktop on Ubuntu Server LTS 14.04

In mid June, my laptop hard disk died. Suddenly, there was a flurry of disk I/O wait, then applications started to report errors trying to write anything.

With a 500GB 2.5" laptop disk lying around that was used for backup, I replaced the dead disk with this one.

I had an Ubuntu Server 14.04 CD lying around, and therefore did not bother to download Kubuntu 14.04.

My laptop's home directory is backed up daily via ssh to the server. So my data was safe.

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How to upgrade a Linux laptop to a new hard disk

Recently my laptop hard disk died suddenly, and I had an unused 2.5" laptop disk lying around, so I just put that in, and installed Ubuntu Linux LTS 14.04, then added the packages I needed.

However, using smartmontools, I found out that the not so new disk has unhealthy statistics, and did not want to risk down time on my main computer.

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Flashing Android OmniROM KitKat 4.4.4 on an Acer Iconia A500 tablet

Attached are the slides from my presentation tonight at the KWLUG on how to flash a custom Android ROM (in this case OmniROM) on the Acer Iconia A500 tablet. The podcast is here.

The whole process was done without any Windows software. All was done from Linux.

  • Getting a CPU ID using APX mode, then getting an SBK (Secure Boot Key) from that.
  • Installing Timmy Dean's V4 Rollback.

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Setting up SPF and DKIM on Postfix to overcome Yahoo/Verizon/Cox DMARC

More and more large companies are implementing more restrictive email policies to fight increasing SPAM. These are mainly DMARC. Such companies include Yahoo, Cox, Verizon, and others.

As this happens, some of your legitimate email may be rejected because email servers are more restrictive.

In order to minimize the probability of your email being rejected, the following describes how to implement Sender Policy Framework (SPF) and DKIM on your already running Postfix mail server.

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Upgrading OpenWRT to Barrier Breaker 14.07, and getting opkg to work again ...

Now that OpenWRT has released a new stable version: Barrier Breaker 14.07, it was time to upgrade my D-Link DIR-835 router running snapshots to it.

Do do this, I first did the following:

1. Save a list of the packages, using the command:

opkg list-installed

Then using some scripting on the output to ignore the version numbers.

2. Updating the /etc/sysupgrade.conf file to look like this:

/etc/rc.local
/etc/syslog-ng.conf
/etc/crontabs/

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