Quote:
Now what I don't understand is why I can't determine on my system if a simple software app is installed or not.
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because you don't seem to know how this is done...
Code:
workstation:~# which cupsd
If this returns nothing then it is probably not installed. I say probably, because that is the name the program has on my machine - it might be different on yours (but this is not likely so).
When I was using Debian - years ago... - I was always using the tool "
dselect" to install software.
It is a text-mode interface to the package management system and lets you see which packages are installed and which are not.
It also shows you descriptions of each package and installs packages which the one you want to install depends on. I found dselect to be the most sophisticated tool...later came apt and different frontends.
I'm not familiar with Debian anymore, but I'm sure they have very good documentation on what tools they provide to install and maintain the software on your machine.