Monthly Archives: February 2011

Change Ubuntu / Debian GDM login screen theme/wallpaper

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Notice: Tested for Ubuntu releases up to Ubuntu 10.10 (Maverick Meerkat)

Every Linux distribution now days sets its default theme and wallpaper. That theme and wallpaper is usually login screen theme and wallpaper. What if you don't like it? You can change theme and wallpaper for your user account but login screen theme stays the same. Lets do something about it...

This is the plan. In a way GDM (Gnome Display Manager) is like every other user. It can have theme, wallpaper and programs to be run when it starts. Why not adjusting Gnome appearance properties (gnome-appearance-properties) window to start at login screen? Then we can adjust things like theme, fonts, wallpaper and everything Gnome appearance properties allows us to do. So first step is to enter this at your terminal (following code is single command):

sudo ln -s /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Next step is to logout. Gnome appearance properties window will start together with GDM login screen and you can adjust everything as you like. The last step is to undo what we have done in the last step. So after next login enter this at your terminal to stop Gnome appearance properties window form showing its face every time you're at GDM login screen:

sudo rm /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Next time you need to change your login screen appearance you repeat this process. That's it. No more steps.

Debian/Ubuntu Gddccontrol as non-root

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There are computer displays out there without any OSD buttons. No, really. I have one of those. So how do you say turn the brightness up? No problem, u have a software with buttons and sliders to control every aspect of you computer display. Collection of protocols to make such application is called Display Data Channel(DDC). On Linux PC you really have only one option, Ddccontrol application and its GUI variant named Gddcontrol...

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Apt-Cacher NG - apt caching proxy on Debian/Ubuntu

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Having GSM Internet connection and multiple Debian based PC in your local network is not every users dream situation. That's especially true if your mobile broadband service provider limits amount of data you can transfer per month for reasonable price, and everything above limit is very expensive. Besides that having flat rate Internet connection and hundred PC inside your LAN could potentially create unnecessary network congestions. Wouldn't it be nice to have some kind of apt caching proxy so we could download apt packages and updates only one time, and then distribute them inside our LAN to all of our Ubuntu or Debian PCs? Author of Apt-Cacher NG apt caching proxy came to rescue with its useful but somewhat hard to setup application. I will explain how to get things moving in 10 minutes max...

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