What would happen, if the repos are changed to the nearest Ubuntu server? Would Deepin 12.12 break? The server in China is too slow and doesn't upgrade anything, well maybe Firefox.

Well you should test that in a virtualmachine. I think it may break deepin. As deepin have it's own repos. Do at your own risk and best of luck.

I will never break..at least for me..

1. I chose the fastest Deepin mirrorlist from Software Center

2. Changed to the fastest mirrorlist in my country, using gedit I edited this file:

/etc/apt/sources.list

3. I left 2 of the fastest mirrors that I get from Deepin Software Center

Done. There you go.