Hi! Debian Friends, Thank you all the help of yours, the ppp dial-out now work!
Now I have another lesson to learn, it's install the XFree86 4.0 (non .deb packages) on Potato. I have already download the necessary binary files of Free86 4.0 (following to the XFree86's document), but I am afraid that if I follow the instruction of XFree86 to install (us Xinstall), it will make the dkpg system confuse (my debian box do not have X Window right now), which way is the better way to install the XFree86 4.0 on Potato? Thanks and have a nice weekend! Alex