Ubuntu 18.10, updated
Tixati is up to date
9 total dl's: 8 show this error - 4 complete, 4 incomplete

We have found zip, zero, nada on this error anywhere. Dl's were cruising along (slowly), and after we restarted program computer, 8 of 9 stopped. We have run our usual cleanup programs ( clean, autoclean and autoremove daily, Bleachbit as needed (weekly, normally)) as we have done throughout this process. No major updates or upgrades to Ubuntu in weeks.

Disjoindered

So, for some (as yet) unknown reason, my system renamed the disk we were saving to, adding a "1" at the end. We discovered this while checking to make sure that the naming systems were still all good. This, of course, would have been a smart thing to check before writing this request. Sorry to waste anyone's time, but we hope someone learns from this. Take care.