sudo apt-get updateW: GPG error:
https://download.01.org Ubuntu Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8D8847D52F4AAA66
sudo apt-get install bumblebee-config-gtk
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package bumblebee-config-gtk is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
bumblebee-config-gui
E: Package 'bumblebee-config-gtk' has no installation candidate
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