Qjackctl or Alsa, sound problems either way

Right now, I have an Ardour 6.5 recording that I sent to my wife’s laptop because I have no sound on my laptop. It sounds fine on hers, and sounds fine on 7 other people I sent it to. It was recorded with Alsa, no Jack.
My buddy even tweaked it and sent it back to me. That tweaked version sounds great on any thing but my ubuntustudio laptop.
Now I opened a new session on the aforementioned ubuntustudio machine, and I can tell that it is picking up the laptop’s sound on all three channels after my usb interface, and recording the tracks, BUT, still no sound from this laptop, or from youtube, or anything else on this laptop.
Volume control shows good volume and youtube on Firefox is working.
This is a Linux sound issue isn’t it…?

Best follow the instructions from the following thread to diagnose the issue:

Thank you Robin; No Feedback blinking
Master-bus has full signal

                         Soundcard is;

arecord -lL
default
Playback/recording through the PulseAudio sound server
surround21
2.1 Surround output to Front and Subwoofer speakers
surround40
4.0 Surround output to Front and Rear speakers
surround41
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50
5.0 Surround output to Front, Center and Rear speakers
surround51
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
null
Discard all samples (playback) or generate zero samples (capture)
samplerate
Rate Converter Plugin Using Samplerate Library
speexrate
Rate Converter Plugin Using Speex Resampler
jack
JACK Audio Connection Kit
oss
Open Sound System
pulse
PulseAudio Sound Server
upmix
Plugin for channel upmix (4,6,8)
vdownmix
Plugin for channel downmix (stereo) with a simple spacialization
usbstream:CARD=HDMI
HDA Intel HDMI
USB Stream Output
sysdefault:CARD=PCH
HDA Intel PCH, ALC3232 Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, ALC3232 Analog
Front speakers
dmix:CARD=PCH,DEV=0
HDA Intel PCH, ALC3232 Analog
Direct sample mixing device
dsnoop:CARD=PCH,DEV=0
HDA Intel PCH, ALC3232 Analog
Direct sample snooping device
hw:CARD=PCH,DEV=0
HDA Intel PCH, ALC3232 Analog
Direct hardware device without any conversions
plughw:CARD=PCH,DEV=0
HDA Intel PCH, ALC3232 Analog
Hardware device with all software conversions
usbstream:CARD=PCH
HDA Intel PCH
USB Stream Output
sysdefault:CARD=U192k
UMC404HD 192k, USB Audio
Default Audio Device
front:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
Front speakers
surround21:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
Direct sample mixing device
dsnoop:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
Direct sample snooping device
hw:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
Direct hardware device without any conversions
plughw:CARD=U192k,DEV=0
UMC404HD 192k, USB Audio
Hardware device with all software conversions
usbstream:CARD=U192k
UMC404HD 192k
USB Stream Output
**** List of CAPTURE Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC3232 Analog [ALC3232 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: U192k [UMC404HD 192k], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0

In Audio/MIDIsetup
Input = UMC404HD 192k
Output= UMC404HD 192k
It has been a long day, so I am headed for sleep. I will check this in the morning here on the West Coast Canada.

OK so far so good. Next check where the audio is going from there.

While Ardour is running, run the following command in a terminal window:

cd /tmp && wget https://community.ardour.org/files/adevices.sh && bash ./adevices.sh

This will not modify your system; it lists all soundcards, their current settings and applications using them.

That should show us which soundcard Ardour is using (and with what settings).