Never mind.? I don't know what I did right (or the right way), but after several hours of searching this group and others, it's working (both with fldigi and WSJT-X) again.? I knew that that particular laptop was working to connect to the radio previously, but for whatever reason, didn't this time.? Again, I'm still learning Linux and don't really understand many/most of the Terminal commands (what they mean and/or what they do, other than the "sudo" command), but I was able to get the laptop and those programs to connect and work, finally,
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Thanks anyhow, Steve - you mentioned adding my username to the dialout group, and I remember finding an article on how to do that, so, yes, I did.? Still wouldn't work in either program at that point, so I did some other things (I don't really remember what they were, because it was 10pm - AZ time - by then and I had been at it since after the club's VE license testing session that morning - the radios in question are actually at the club station [ - that site hasn't been updated in a while, so it only shows the IC-7300 and not the new(er) FT-dx10] and I'm the Station Manager).? And, yes, /dev/ttyUSB0 was the correct one, in both instances (fldigi and WSJT-X).
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Now on to working on the club station's OTHER radio, the FT-dx10; Since I'm the station manager, I have the privilege of being able to use them (almost) any time I want to, "as if" they were my own, so I do a lot of contesting from there, under my own call, but using my own laptops/logging software, even though the station does have a dedicated computer (desktop) for each radio; one of the club's rules is that operators there can't log their own QSOs on the club's computers.
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Mike, W1DGL
Prescott, AZ.
YARC (Yavapai Amateur Radio Club) club station manager
DM34sm/so
(DM34sm is my home QTH; DM34so is the club station QTH)
W1DGL