Guys, this information is obsolete. I see there is a better way of running osu! in Linux now. I'm sorry I haven't been able to update this post as I had to use Windows since mid 2010, although I've got a Ubuntu 12.10 running here so I may update the first post soon.

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I searched the forum about running Osu! in Ubuntu, but it was locked.
So I'm making a new thread about this.
Sorry if someone had posted this before, moderators can delete this.
Ok, let's go!

Make sure you have wine. Here's a compiled wine package for Ubuntu
http://rapidshare.com/files/247110241/w ... 1_i386.deb

Once you have wine, do this:
First up, Open up your terminal (Right click on your desktop, and click "open terminal here")
Second, type: sudo apt-get install cabextract (It will install cabextract) Do not do anything until It's done
Third, type this: wget http://kegel.com/wine/winetricks (It will download a file called winetricks, don't delete it)
Fourth, type: sh winetricks corefonts dotnet20 (It will execute winetricks, and then It'll download and Install .NET Framework 2.0). This is important, do not do anything until it's done. When you see a .NET Framework Installation wizard, just click next until you done. After that, terminal will keep downloading font files so keep opening the terminal until everything is done.

Now, try running Osu, or If you haven't installed it yet, just install it to "My Documents".

You should be able to run Osu! now. I've tested it,


Cheers
KcL

Update: Screenshot added!

Oh, nice, osu! works with wine.

Unless the user runs as su, prepend sudo to the apt-get.

Well can someone test it?
On my computer it's very laggy when playing. So it's unplayable. I've set it at 800x600 and disabled all effects (even snaking sliders)

And yeah, I use Onboard VGA here, might try doing some tweaks on winecfg.

Edit: It's laggy when there's slider coming, when there's no slider, it's not laggy. Even with Snaking Sliders disabled it's laggy for me.

I tried to switch to OpenGL renderer on the Osu's settings menu. But after that, the game restarts and then it won't start until i delete the .cfg files.

Or should I run: wine osu.exe -OpenGL ?

I will test at Ubuntu later on. Xubuntu lacks too many libraries and maybe it causes OpenGL isn't working.
Still downloading Ubuntu at 45kbps speed..LOL (Slow Internet at Indonesia lol)

This failed on a 32-bit Debian install in VirtualBox with a 64-bit Windows Vista host with Xmingw as the X server though SSH via PuTTY. So if you were thinking about trying on that, don't bother. ;P

Next time I have to do computer maintenance and data's backing up or something, I'll try this out.

Hmm, Maybe it's failed because you're running it on Virtual Environment. Some components might not works in VirtualBox.

I think it's because Mesa isn't supported by Wine all right for OpenGL stuff. I should try installing a GUI on another VM to see how that works out.

There's no Wine for 64 bit?

Just download the compiled at http://www.getdeb.net
I think there's 64 bit version..

Still wondering why OpenGL won't work

Yeah, I was wondering why people were downloading the .deb's manually.

Also, it's

or aptitude instead of apt-get.

Different Linux distros have different package managers and thus require different commands, of course. I'm sure this doesn't work only for Ubuntu and variants.

KcLKcL, of course there's 64-bit wine. If you install wine using your package manager you'll probably get binaries with the same target as your kernel, so if you're on 64-bit you'll get a 64-bit wine.