Ubuntu seems to be so relevant, that it has a dedicated Stack exchange page.
But how do I know, when to post at Ask
MintSuSEcentOSGentooArchWindowsReactOSUbuntu and when to post at Unix/Linux.StackExchange.com?
The latter one is probably for more general questions. But I guess, that AskUB.SE would also fit for similar distributions such as LinuxMint or Ubuntu-Studio (which I use at the moment, burned DVD).