I'm a relatively new Ubuntu user (long-time Mac snob on my personal computers, though a Linux user at work). I have a newish Dell laptop which came with Ubuntu 16.04LTS installed. I find that the combination of compiz + multiple workspaces seems to hang a lot, especially when dragging windows between workspaces. This problem is bad enough that sometimes the only possible response seems to be the power button. Clearly, not a long-term solution. At other times, I've noticed that a terminal window seems to have focus and have been able to type "pkill -f compiz", which zaps and replaces the hung instance with a fresh one.
For the moment, I've disabled multiple workspaces and will see if that improves matters, but that's not a longer-term solution either. I'd much prefer virtual desktop support over a window manager which seems to hang with distressing regularity. How can I (permanently) replace compiz with another window manager? Just about anything would be fine, metacity, fvwm, etc. I'm sure there are plenty of window managers available, but don't know what they all are, or how to dump compiz.
Google hasn't been my friend so far. I did find a reference to running "metacity --replace", but that just hung the computer. Most searches seemed to turn up posts referencing older versions of Ubuntu which had somewhat different user interface bits, making it tough-ish to follow instructions.
Any pointers appreciated.