Public bug reported:

A lot of people, like me, had NVidia drivers installed and disabled
since around Ubuntu 12.04, when you could easily choose whether to use
them or not. Since they were buggy with some models of NVidia cards,
many of us just turned them off.

It wasn't necessary to uninstall them at that time. You would just go to
a nice System Settings screen and you would turn them off and forget
about them. And there was no warning or indication that you were
supposed to uninstall them.

Recently, in order to fix #1431753, an automatic update has been
released that replaces NVidia drivers 331 with 340.

Unfortunately, it also forcefully reenables them, as now having NVidia drivers 
installed but disabled is not supported any more.
So, people like me who had NVidia drivers 331 installed and not being used, now 
have NVidia drivers 340 installed and enabled, and since they are exactly as 
buggy as version 331 (causing random inability to boot half of the times, and 
random screen freezes when using the touchpad), this is a major annoyance.

An automatic update that breaks a working system has a bug, no matter
what; and this is especially unquestionable if, whatever configuration
that causes the system to break with the new update, was not the result
of the user's tinkering and touching stuff he wasn't supposed to touch,
but was just a configuration that at some point had been supported, and
which had been established via the standard user interface provided in
earlier versions of the system.

This situation must be fixed without obliging the user to take any particular 
action.
If that is not possible, then the next update should cause a popup message to 
be displayed, instructing the user about what to do if in order to (100% 
safely) disable or uninstall NVidia drivers if he needs to.

** Affects: nvidia-graphics-drivers-340-updates (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1485117

Title:
  "Fix" for #1431753 enables nVidia drivers even if formerly disabled,
  potentially breaking working systems

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