Well, it only works with "ifconfig". I modified the configuration manually, and then I used "ifdown eth0" and "ifup eth0" to use the config. that I wrote manually, and worked fine, but on the graphic interface it didn't show the gateway, althought the Internet connection was working OK.
-- Can't configure network gateway IP (LiveCD). Knot 2 https://launchpad.net/bugs/58737 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs