place help,i run ubuntu 10.04 on my old pc pentium 4, 500mb ram ,how can ido for make faster..

To make the Ubuntu faster? Add more RAM to the machine, or upgrade the CPU to a faster/better one. Upgrading the video card may help too, but I would do the first two things first.

How to make your existing machine faster, without buying new hardware? Don't use Ubuntu - use a lighter-weight distro, maybe Xubuntu for example, though there are lots of other lighter distros that would perform a lot better on that machine.

Cheers!

May I recommend my own nFluxOS Ubuntu editions (Lucid & Meerkat)
the Lightest *buntu there is
http://multidistro.com/

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Hi,

More RAM!

Replace distribution!

Vector Linux, Slackware and Dream Linux would be much faster on the machine.

On Ubuntu,
You can also remove unnecessary services through 'boot-up manager'
restrict applications that start-up automatically on start up
Install XFCE and the LXDE desktop and use one of those instead of Gnome or KDE

Besides whats already been said (remove unused services, autostart-apps and consider using a distro which comes that way out of box) try this:
1)gconf-editor:
applications->metacity->general and activate "reduced resources"
2) consider using a different window-manager instead of metacity (say icewm or openbox) for your gnome
3) use light gtk2-engines, for example the gtk2-engines-xfce are quite light
4)remove the background image

I use xfce on PC's with similar specs and it works good. Enlightenment is ok too. All window-managers are ok.
As far i can see the main problem are all the services.