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The mic is visible in "PulseAudio volume control". It is not muted and volume is at 100%. I can see it picks sounds. It is also visible in arecord:

$ arecord -l | tail -n 3
card 3: Microphone [Trust GXT 232 Microphone], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

$ arecord -L | tail -n 39
sysdefault:CARD=Microphone
    Trust GXT 232 Microphone, USB Audio
    Default Audio Device
front:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    Front speakers
surround21:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    Direct sample mixing device
dsnoop:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    Direct sample snooping device
hw:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    Direct hardware device without any conversions
plughw:CARD=Microphone,DEV=0
    Trust GXT 232 Microphone, USB Audio
    Hardware device with all software conversions

The mic is not available for selection in Audacity (I tried all options, launched Audacity after mic was connected). It works oob in Windows 10 in Audacity.

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