Ubuntu tips

*locale setting
dpkg-reconfigure locales

*xserver setting
dpkg-reconfigure xserver-xfree86
or
dpkg-reconfigure xserver-xorg(above ubuntu hoary)

*apm setting(for an old PC)
To enable APM on a system, edit your /etc/modules file and add apm to the list of modules. Also, edit the #kopt line of your /boot/grub/menu.lst file so that it ends with apm=on, and then run sudo update-grub to update the GRUB configuration. Add the modules shpchp and pciehp to the end of the /etc/hotplug/blacklist file (they don't work w/APM). Finally, reboot the computer. If your system supports APM, everything should be set up. Close the laptop lid (if you have a laptop) or press the Sleep button to suspend to RAM.Some systems may not work properly with this, and many new systems don't support APM at all. In this case, search for information on suspending your particular laptop in the wiki or elsewhere. Also, if APM doesn't work, try ACPI. Note that APM doesn't support all the power management features of many newer laptops, and also doesn't work with suspend-to-disk using the code in the kernel.
<< http://ubuntulinux.org/wiki/SuspendHowto >>

*environment setting
vi /etc/environment