I'm trying to install a printer driver (from Epson if it matters) but when I try to unpack the .tar.gz file I'm getting a directory called epsonscan2-bundle-6.6.42.0.x86_64.deb instead of a file.
I tried just installing with dpkg or apt as per How do I install a .deb file via the command line? however
apt reasonably responds E: Read error - read (21: Is a directory) -- dpkg's objection is that the directory is not a Debian format archive
There are a dozen different questions about installing .deb files in general, but none that I can find that address a file that is actually a directory.