Why doesn't sudo apt install install a .deb file?

Question

linux

I'm trying to install dkms but it says the file is not supported

Answer 1

Because dpkg -i.

Answer 2

Because dev != deb.
Check file typefile *.dev

Answer 3

you need to specify the path to the .deb file.
if it is in your current directory, then the command will look like this:
apt install ./<package_name>.deb