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I have a custom preseed file for a Precise Live CD (which is well loaded on boot, I checked syslog for that).

My initial problem is that when booting in install mode (default behavior for a Live CD), ubiquity runs X with a default wallpaper which is hardcoded to /usr/share/backgrounds/warty-final-ubuntu.png in Ubiquity code.

So my idea was to run early_command ( to copy my custom wallpaper over /usr/share/backgrounds/warty-final-ubuntu.png.

Assuming my custom wallpaper allready resides on the rootfs in /usr/share/backgrounds.

But... It seems the early_command never runs (and I'm sure the preseed file is taken into account)

Here is what I have added to my preseed file:

d-i preseed/early_command string cp /usr/share/backgrounds/mywallpaper-defaults.jpg /usr/share/backgrounds/warty-final-ubuntu.png

Even this one is never run:

d-i preseed/early_command string /usr/bin/touch /tmp/testearly

Thanks for helping !!

share|improve this question
up vote 3 down vote accepted

preseed/early_command is run in the initramfs. If you intend to affect files in the live environment, you need to prefix the filenames with /root.

This will not affect the installed system. If you want that, you're better off changing the squashfs directly.

share|improve this answer
Thanks ! My aim is specifically to not affect the installed system nor the squashfs as I don't want to broke ubuntu wallpapers package. I want this change to be a 'volatile workaround' from the running live system fs as I can't do anything else cleaner :/ Note that this problem only affect "install" mode as lightdm is not used (but ubiquity-dm). – martin-mystere Jun 25 '12 at 14:48
Updated wiki page: – martin-mystere Jun 25 '12 at 15:04

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