To check if a package is installed on Ubuntu/Debian/Mint, do:
This will display information if dkms is installed.
$: dpkg -s dkms
This will display information if dkms is installed.
Reference(s):
http://www.cyberciti.biz/faq/find-out-if-package-is-installed-in-linux/
http://www.cyberciti.biz/faq/find-out-if-package-is-installed-in-linux/
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