Four screens, a Mozilla window on screen 1 and another window on screen 4.
Terminal open in screen 2 with multiple open tabs and open logins to remote sites.

The Mozilla instance on screen 4 crashes. The window manager goes through a
series of fits and when all settles down, Mozilla has restarted the crashed window, but all its open windows are now on screen 1 and the Mozilla on screen 1 has now moved to screen 4. Not only that, but all open instances of Terminal were killed off.
Beyond that, various window manager settings have changed default behavior,
so that e.g. clicking the mouse to the left of a leftmost-column icon no longer displays the available windows for that application, but the user must now click to
select which window was wanted.

Again:

LibreOffice on screen 3. A slightly off-centered mouse click to try to change tabs while doing "Format->Paragraph" crashes the application, kills off all other windows running under the window manager and leaves the screen totally black and useless until I log in from outside and kill -1 the "lightdm" process. Shades of losing work
because one was using Microsoft, but this is not Microsoft.

I'm going to bitch now, so fair warning.

This is fricking UNIX and UNIX is not supposed to give a crap if an application dies. If Mozilla or LibreOffice want to crap out that is their problem, but under no circumstances can that be allowed to interfere with ANYTHING ELSE RUNNING, and certainly the window
manager should NOT GIVE A DAMN and NOT BE AFFECTED.

I strongly suggest that all the developers who so anxiously want to make the interface "cooler" and "neater" such that every damned release forces a new window manager on the user - how about telling these people that they have to FIX THE DAMNED BUGS in the prior version before they move on to their next toy of yet another window manager. That will slow them down.

There's no point buying a car with a "good warranty" if that car has to spend all its time in the shop being repaired, under warranty or not. Open Source is supposed to be about USER CHOICE and the least that Ubuntu should do is offer a CHOICE OF WINDOW MANAGER at install time so that the user can keep using the interface they're familiar with. This also means that a series of window managers must be maintained and debugged in parallel, but that should not be so much overhead as surely enough people can be lined up behind each of them to keep
them maintained.

Now Ubuntu 14.04 performs MUCH WORSE than my old version 9 system because the least thing that goes wrong with an application totally messes up everything else I was doing. Version 9 provided correct process isolation, version 14 does not. I am surely hardly the only person who has noticed this. If you let things go on this way, Ubuntu will lose any claim to being a good system and you will have killed off what ought to be and remain the World's Champion. Now LibreOffice and Mozilla are much more crash-prone than they used to be, plus thanks to bad "lightdm" QA, if they crash they take all the rest of the user's work with them. I need a parallel FreeBSD system to be able to keep terminal windows open
with any certainty ... and that's bankrupt and absurd.

Please fix this.

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