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Fix “The URL is not valid and cannot be loaded” in Firefox on Ubuntu

by Chris Jean

September 9th, 2009

In Linux, clicking the middle mouse button (or mouse wheel) pastes the most recently highlighted text from any application. This is useful; however, it has an extremely-annoying side-effect in Firefox. Whenever I middle-click outside of entry fields, I get an annoying pop-up that says: “The URL is not valid and cannot be loaded.” This frustrates me to no end. It usually happens when I accidentally nudge my mouse and miss middle-clicking a link in order to open it in a new tab.

So, why is it doing this? Turns out that, by default, Firefox for Linux allows you to use this middle-click to paste functionality to allow you to navigate to a highlighted URL simply by middle-clicking non-editable portions of the page. When an invalid URL is the result of the paste, the annoying popup appears.

Today, I found out how to get rid of this annoyance.

Open a new tab in Firefox and navigate to “about:config”. This will take you to an interface that allows you to tweak and configure very specific functionality of Firefox.

In the “Filter:” text box, enter “middlemouse.contentLoadURL”. This should present a single entry that lists the option as having a value of “true”. Simply double-click the listing to change the value to “false”. The effect is instantaneous.

Now when you middle-click outside of editable areas in Firefox, it will no longer try to navigate to a URL. This change only modifies the navigation to URL functionality; the middle-click to paste in editable areas still functions.

If you like the middle-click to scroll functionality found in other browsers/operating systems, then search for “general.autoScroll” and double-click the listing to change it to true. Now you can middle-click to initiate scrolling.

Categories Linux, Tips 'n Tricks
Comments (26)

Upgrade to Firefox 3.5 on Ubuntu 9.04 – Jaunty Jackalope

by Chris Jean

July 1st, 2009

Updated for Firefox release 3.5.5

Firefox 3.5 was released yesterday. This is an exciting new release complete with features such as support for HTML 5, video and audio that works in the browser without the need for plugins, a much faster Javascript engine, a native JSON parser, private browsing mode, support for SVG transformations, and other great enhancements.

I’m sure that you’re just as excited to get started with Firefox 3.5 as I was yesterday when I heard the news. But wait! We’re on Ubuntu, we can’t just install whatever we want, we need to wait for a package. Right? Wrong.

Here’s a really quick way to get 3.5.5 running on your Ubuntu 9.04 system.

Categories Linux
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Change Default Application When Opening Files in Ubuntu

by Chris Jean

April 21st, 2009

Now that I know how to do this, it seems so easy and straight-forward. To change the default application files of a specific type are opened with, do the following:

Right-click a file that you wish to change the default application for and select Properties.
Click the “Open With” tab.
Select the desired application’s radio button.
- Additional applications can be added if the one you want is not listed. Use the Add button to find the desired application.
- You can also remove applications from the list by highlighting the application and clicking the Remove button.
- Adding applications to or removing applications from this list changes which applications are available in the “Open With” option when you right-click a file.
Click the Close button.

Again, it seems so easy and straight-forward now. Go figure. 🙂

Categories Linux, Tips 'n Tricks, Videos, WordPress
Comments (1)

Gaarai is Back and the Jackalope is Jaunty

by Chris Jean

April 18th, 2009

It’s been a month since my last post. For all my regular readers, I’m very sorry for the absense.

There’s a lot of intersting stuff going on right now. Fortunately, with so much going on, I shouldn’t have a lack of topics to talk about.

To get the old post ball rolling again, how could I not start back up with Ubuntu 9.04?

Categories Linux, Random Ramblings
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Changing When Daily Cron Jobs Run in Ubuntu

by Chris Jean

March 18th, 2009

Linux has many great tools built in that help maintain the system without user intervention. One such tool is Cron.

On my Ubuntu 8.10 system, there are many things that are set to run each day: locate database updates, misc cleanup utilities, automatic package updates, log rotations, etc. All of these are managed by the Cron system.

For a while, I needed to manually run the updatedb command to update the locate database, and I never thought about why. The problem is that my daily, weekly, and monthly Cron jobs never run. The reason for this is that these Cron jobs are scheduled to run very early in the morning, when my system is off. Thus, these job schedules never run.

The solution for this is easy. I simply need to change the times these run at to times when my system is on.

Categories Linux, Tips 'n Tricks
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Goodbye Subversion, Hello Git

by Chris Jean

March 17th, 2009

As I mentioned before, I want to switch from using Subversion for project code collaboration and versioning to Git.

I’m switching not because I have some idealogical dread of Subversion or its methods. In fact, I quite like how much easier Subversion has made handling code collaboration. The problem I ran into is that Subversion has become doggedly slow and bloated.

For example, a simple project with a current working size of 2.9MB has a Subversion repository that is a massive 98MB in size. Furthermore, it takes a full four minutes to commit a change, even a simple one-line change to a text file. During this commit process, my server’s dual quad-core processors are essentially maxed. Why the repository has become so amazingly large and why the commits take so long, I’ll never know. The maxing out of my server for four minutes per commit is also unacceptable since there are times where minor changes will need to be made to more than a dozen repositories at a time. Multiply the number of commits by 4 minutes a piece, and not only is a terminal on my system tied up for more than an hour, but my server’s CPU is maxed for just as long.

Beginning last week, I dug into Git and learned what I needed to know. The initial impressions are great; however, Git is not without its problems either. The primary problem with Git is that its syntax is extremely-obscure, IMHO.

Categories Development, Linux, Random Ramblings
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Run Virtual Machines Without the Host OS

by Chris Jean

March 14th, 2009

These days, I really want to dabble around more with virtual machines. They have a lot to offer for benchmarking and failover protection. However, I always thought that you needed a host OS to run the virtual machines in. In my experience, this was clunky at best and riddled with problems such as automatted startup of virtual machines, stability of the host OS, and degraded performance.

I’ve used virtual machines lately with Sun’s VirtualBox, a free virtualization platform that can run virtual machines. This has been valuable for testing different distros, but wouldn’t suffice for running virtual servers. At least, it wouldn’t based on my experiences.

I have a friend that has worked professionally with virtualization technology for a few years, and he pointed me to a VMware product called ESXi. Not only is ESXi free, it runs as the native OS in which other OSes can run virtually.

I have yet to test it out, but it shows great potential. If you have any experience with ESXi, I’d love to hear it.

Categories Development, Linux, Tips 'n Tricks
Comments (2)

World of Goo

by Chris Jean

March 13th, 2009

There’s a very good chance that you have already heard of the game World of Goo. If not, check out this video to get a taste.

This game has a number of great things going for it:

It’s a heck of a lot of fun to play.
The world if very unique and has a fun feel to it.
The music really sets the mood for the different areas.
It supports Windows, Mac, and Linux.
It’s DRM free.

These days, I find great favor in things that 1) have Linux support and 2) are DRM free. Since World of Goo looked like a ton of fun and had both of those, the $20 price tag was nothing. Frankly, the price is very small when you consider the many hours of fun that you can have with all the goo balls.

I ran World of Goo both on one of my Windows Vista machines and on my Ubuntu machine at home. It worked very well on both platforms. Even the Linux version was very smooth even though I’m running Compiz.

FYI: If you want to run this on Linux, you can get the software as a DEB or RPM package or as a tar.gz archive with all the application files. I recommend usingone of the package files. Since the packages are built for 32-bit, you will need to use these instructions if you have a 64-bit distro.

I highly recommend World of Goo, but you don’t have to have blind trust in my opinion. You can download the demo and try it out for yourself.

You might be interested in their post about the release of the Linux version. The day of the Linux release, sales were 40% higher than their previous highest-selling day. “There is a market for Linux games after all :),” said one of the developers after updating the post.

Categories Linux, Random Ramblings
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A Good Video on the History of the Open Source Movement

by Chris Jean

March 12th, 2009

I recently watched the entirety of the Revolution OS documentary. While it definitely is not a video that can be enjoyed by most people, nor even most computer users, it is a very intersting watch for a number of reasons.

Visiting the documentary’s site, you quickly gain a sense of what this documentary is aimed to be: “… the inside story of the hackers who rebelled against the proprietary software model and Microsoft to create GNU/Linux and the Open Source movement.” However, that’s not what this video is about.

When I first started watching the documentary, I thought I would get this intimate insight into how people made calculated movements against the growing monopoly of Microsoft’s operating systems. In fact, this isn’t anything near what actually happened.

Categories Linux, Random Ramblings, Videos
Comments (2)

Updating Daylight Saving Time on Linux

by Chris Jean

March 10th, 2009

A few days ago, I blogged about changing the timezone on a Linux server. In the post, I mentioned how the zoneinfo files needed to be updated in 2007 due to congress expanding the number of days that Daylight Saving Time covers. However, I did not go in depth about how to update the zoneinfo files.

Since then, I’ve received many search queries from people looking for information about why their server did not properly update when the Daylight Saving Time change hit. For instance, I got queries of “is daylight savings default in centos”, “daylight savings time didn’t change centos”, “dst timezone change centos”, and many more. It’s clear that there are server administrators out there that are very confused about the Daylight Saving Time situation on their server.

Today, I hope to remedy that problem and give server administrators the information they need to update these zoneinfo files. I typically focus in on specific platforms, but today, I’ll try to cover as many distros as I can as well as provide a universal solution.

Categories Linux, Tips 'n Tricks
Comments (6)

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