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Sorry for using English.

I'm a rookie with linux. I have Ubuntu 6.06 and gcc 4.03 installed. Now I want to downgrade my gcc (g++) version to 3.4.X and remove gcc 4.0.3. How can I do? Thank you very much for your help!

you don't need to downgrade gcc, just install the version you want.
system will make a symbol link to gcc, either gcc4.03 or gcc3.4.x
you can re-symbol it, or just edit your Makefile you used, change CC=gcc to CC=gcc3.4.x