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Is there a way to change the system font completely? I mean I want the font from login in screen until every application follow the change.

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The font settings are stored in gconf and can be changed easily with gnome-appearance-properties. They can also be changed using gconf-editor or the commandline-tool gconftool-2.

If you want to change the fonts of the login-screen you have to run these tools as the user gdm like this:

sudo -u gdm dbus-launch gnome-appearance-properties

In some cases this doesn't work and you have to go a more complicated way:

  1. Log out (so that you are on the login screen)
  2. figure out what displaynumber the login screen has by pressing Ctrl+Alt+F7(F8,F9). If the login screen is on F7 its number is 0, on F8 it is 1, ..
  3. change to a blank terminal with Ctrl+Alt+F1 and log in with your user. Now run the above command like this (with the correct DISPLAY):

    sudo -u gdm DISPLAY=:0 dbus-launch gnome-appearance-properties

  4. now change back to GDM and you should see the appearance properties dialog where you can make any changes you like (background, too).

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Any idea how this has changed with the move to LightDM (from gdm)? – Oli Nov 23 '11 at 0:04

Maybe you need to go to System-->Preferences-->Appearance-->Fonts and change it from there.

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the font at login screen won't follow the change. – DannyCju Nov 3 '10 at 14:42

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