Ubuntu 18.04 should recognize a Behringer UMC1820. When I was running Xubuntu 18.04 a while back mine was recognized and worked. I moved to 20.04 and it worked there too, and now on Manjaro ?.?? it still works.
The original "error opening audio input device" message still sounds to me like the hardware was grabbed by another process that won't relinquish control.
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Glennbo
Hear My Music - Click Me!!!
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