In Synaptic, when I click File > Add downloaded packages and navigate to the folder with the debian packages, the debian packages are greyed out, which means I cannot select them.
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2 Answers
According to this question you are misusing this feature. Apparently, this feature in Synaptic is not for installing individual DEB package files.
To do this - without using the command line - navigate to the folder where the packages are and double-click one (or more?) of them. This will bring up the Package Installer and you should be good to go.
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complementing @Mei answer: https://askubuntu.com/a/107521/46437
as an alternative to accomplish the final goal.
search for: Debian/Ubuntu: Making a Package Repository on Your LAN
(best shot, has the commands) How to create a local APT repository?
http://freesoftwaremagazine.com/articles/debianubuntu_making_package_repository_your_lan/
https://www.maketecheasier.com/setup-local-repository-ubuntu/
this way is easier when there is a lot of dependencies like trying to install yakuake on ubuntu 18.04 :)
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