Your computer probably needs to restart or just try refreshing the page, it works for me :) (Also, maybe try logging off, closing window, then log back on.)
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Your computer is obviously too old to play Roblox. Roblox updates often and occasionally old computers will fall out of the range of PCs that support Roblox. Try updating your computer's drivers and perhaps the problem will fix itself.
ROBLOX is a Online Game for PC. It does not work on Xbox 360. But you can try to plug a Xbox 360 controller on you're PC then install alot of programs to make it control ROBLOX. But roblox will still appear on you're Computer Screen, not on TV. And it will run on the Computer too (Meaning that if you're computer lags, roblox will still lag). But some of the ROBLOX administrators made a video showing ROBLOX running on IPad, so it will be another possibility.
Maybe your computer or Roblox hanged..If not, you can try refreshing it or trying another game. If this still not work, ask Builderman about it.
Roblox does not support Ubuntu, or any other Linux operating systems. You can download the Roblox installer, but it won't work if you try to run it. If you really want to play Roblox, you may want to install a copy of Windows on your computer.
Try going into Edit mode (Run Roblox Stuido) the object is likely to be unable to place on the ground because of objects blocking it such as yourself.