I've had exactly the same problem described above. Installed Nvidia drivers via 
via Additional Drivers and all was working fine.
After that I decided to remove the Nvidia drivers and rebooted the laptop. My 
screen resolution was set as 640x480, without any possibility of changing it.
Asking for help, on #ubuntu+1 @ Freenode, someone told me to check 
/etc/modprobe.d for a nvidia conf file. I've done that and it was there.
Deleting the file and rebooting the laptop solved the issue.


You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-340 in Ubuntu.

  Uninstall left nouveau blacklisted

Status in nvidia-graphics-drivers-340 package in Ubuntu:

Bug description:
  Following a successful install and subsequent use of nvidia-340 -
  uninstallation of nvidia via Additional Drivers led to a reboot to a
  desktop at 640x480 px.

  Investigation found an nvidia created file left on the system
  blacklisting nouveau, deleted file and rebooted to normal desktop.

  Didn't think about ubuntu-reporting this - can try and replicate and
  apport-collect if it's of any use.

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