I installed Ubuntu 11.04 to that. Its case is ANTEC NINE HUNDRED TWO v3. The power unit is on the bottom. It has three air filters inside on the front side and on the left side of the case. The clean-up of the dust on the sides is hard for ejecting those filters.
I could use REX-SATA3
To be advised on IRC@2ch, I put RATOC’s REX-SATA3 removable case on the bottom since the removable case is too long for putting on the top of the PC case. I can use the removable case on Ubuntu 11.04 and 11.10 now.
cf. https://forums.ubuntulinux.jp/viewtopic.php?id=12126 (Japanese)
I cleanly installed Ubuntu 11.10 on the PC
Now Ubuntu 11.10 is released on 14. Its default desktop is Unity. But I dislike it. So when I upgraded from Ubuntu 11.04 on the PC, I tried installing XFCE, Xubuntu desktop, and Gnome shell. But I don’t know how to delete “XFCE” on the lightdm and I feel it complicated for some others… So I cleanly installed Ubuntu 11.10.