Versions of ubuntu after lucid won't run on older cpu i486,i586 without cmov instruction.
Xorg-server doesn't write a xorg.conf unless X -configure
is run manually or called by a script.
tazx is the script in slitaz which calls up X -configure and attempts to setup xorg on boot. In slitaz-4 it splits xorg.conf into a file for each section preceded by a number and installs them to /etc/X11/xorg.conf.d
Satellite 4025CDT specs:
http://support.toshiba.com/support/staticContentDetail?contentId=638220&isFromTOCLink=false
Video memory is 2MB
Resolution
Colors Support
Full Screen 1024 x 768 64K colors
Maximum full screen resolution is 1024x768 with 64k colors which is 16-bit high color is possible.
I would remove any configuration you made to /etc/X11/xorg.conf
Delete all /var/log/Xorg.*.log files so a fresh one is created.
These tools in combination with /var/log/Xorg.*.log give information needed to maybe improve the configuration.
Open terminal as root.
tazpkg -gi xorg-xwininfo
xwininfo
Click + mouse cursor in xwindow
Post the output.
tazpkg -gi xorg-xdpyinfo
xdpyinfo > xdpyinfo.txt
cat /var/log/Xorg.0.log > xorg.log.txt
Attach xdpyinfo.txt and xorg.log.txt to your reply.
If tools report 24-bit color at lower resolution than 1024x768 we force to 16-bit color with DefaultDepth 16 in 70-Screen.conf to enable increased resolution to 1024x768