nvidia-prime works great now, but on my kubuntu system I had to install
python-gtk2 to use PRIME Profiles in nvidia settings
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https://bugs.launchpad.net/bugs/1268771
Title:
NVIDIA
I had the same problem. Deleting grubenv had no efect.
Solved it temporarily using following commands in recovery shell
# cd /boot/grub
# rm grubenv
# grub-editenv grubenv create
# grub-editenv grubenv set default=0
# grub-editenv grubenv list
default=0
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invalid: environment block
