This definetly appears to be a bug in the way sudo/gksudo handles things...
No matter which window manager you use, using sudo ubiquity will always work fine, and using gksudo ubiquity, even from a command line, will fail.
On compiz, the window is drawn, but hidden (you find out if you try to kill it - it pops up, saying "are you sure you want to quit the installer?), and in metacity, the entire installer just freezes.
This definetly appears to be a bug in the way sudo/gksudo handles things...
No matter which window manager you use, using sudo ubiquity will always work fine, and using gksudo ubiquity, even from a command line, will fail.
On compiz, the window is drawn, but hidden (you find out if you try to kill it - it pops up, saying "are you sure you want to quit the installer?), and in metacity, the entire installer just freezes.