Orca has been crashing a lot lately.. and I don't know how to restart it. Is there any way to do this from the command line? I cannot find Orca anywhere in the main menu.
According to the Orca FAQ on Using Orca, simply run (from a command line)
If that does not work, I see in the Ubuntu packages that this is named "gnome-orca", so you might try that as a second effort.
The 'nohup' in front lets you close the terminal window after restarting, without killing the process it started.