In the tweak app there is nothing under shell, see screenshot (its grayed out)
to 2)
the package can not be found
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
mbeerli@GS1:~$ sudo apt install nvidia-driver-390
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package nvidia-driver-390
mbeerli@GS1:~$
In the tweak app there is nothing under shell, see screenshot (its grayed out)
to 2)
the package can not be found
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
mbeerli@GS1:~$ sudo apt install nvidia-driver-390
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package nvidia-driver-390
mbeerli@GS1:~$