Time flies. I got my Ubuntu 9.04 last Aug now almost a year later, I just have Ubuntu 10.04 64-bit installed. (I upgraded to 9.04 from 8.10 but this 10.04 is a fresh install. Super smooth..)
Following is a list of post-installation things I have done to make Ubuntu works for me:
1. install Chinese input method.
No need to add Chinese font. Ubuntu by default displays Chinese web pages ok. You need to go through the following to add Chinese input support: Click System menu=>Preference=>iBus preference=>Input Method=>Choose Chinese Pinyin-vi (my choice) from the list then click "Add". That's it. You now can click the small keyboard icon at the top right corner to choose Chinese method.
2. install Firefox Flash plugin
Click System menu=>Admin=>Synaptic Package manager=>Search "nsplugin". Then select both Nsplugin and Flashplugin-installer. Click "Apply" to install both. Restart Firefox. Done.
Will update later if I find anything else.