This is what I got after running
1) sudo killall fwupd
2) sudo /usr/lib/x86_64-linux-gnu/fwupd/fwupd -v 2>&1 | tee fwupd_debug.log
21:57:58 Verbose debugging enabled (on console 0)
21:57:58 adding plugin
/usr/lib/x86_64-linux-gnu/fwupd-plugins-1/libfu_plugin_steelseries.so
21:57:58 adding plugin
/usr/lib/x86_64-linux-gnu/fwupd-plugins-1/libfu_plugin_test.so
21:57:58 performing init() on test
21:57:58 Loading fallback values from /etc/fwupd.conf
21:57:58 adding udev device:
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0
21:57:58 fixing GUID 0x10de:0x1040->693025a1-4a7d-53b8-864e-c7f3e5866ec0
21:57:58 emit added from Udev:
ro__sys_devices_pci0000_00_0000_00_02_0_0000_01_00_0
Failed to coldplug: UEFI firmware updating not supported
***
21:57:58 Failed to coldplug: UEFI firmware updating not supported
***
21:57:58 emit added from USB: usb:00:04
21:57:58 emit added from USB: usb:00:03
###############################################################################
@0551ms AsStore:load 551ms
###############################################################################
@0551ms AsStore:load{per-system} 551ms
#
@0005ms
AsStore:app-info{/usr/share/app-info/xmls/org.freedesktop.fwupd.xml} 5ms
#
@0022ms
AsStore:app-info{/var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz}
11ms
#
@0022ms AsStore:store-from-file 11ms
###
@0046ms
AsStore:app-info{/var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz}
23ms
###
@0046ms AsStore:store-from-file 23ms
##########################################################
@0452ms
AsStore:app-info{/var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz}
406ms
##########################################################
@0452ms AsStore:store-from-file 406ms
#############
@0547ms
AsStore:app-info{/var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz}
94ms
#############
@0547ms AsStore:store-from-file 94ms
### @0593ms FuMain:coldplug 24ms
## @0584ms FuMain:coldplug{Udev} 15ms
# @0578ms FuProviderUdev:coldplug{usb} 9ms
# @0584ms FuProviderUdev:coldplug{pci} 5ms
# @0593ms FuMain:coldplug{USB} 8ms
# @0593ms FuProviderUsb:added{258a:0001} 5ms
21:57:58 FuMain: acquired name: org.freedesktop.fwupd
21:57:59 devices now in store:
21:57:59 1 com.steelseries.rival-legacy.firmware Rival
SteelSeries
21:57:59 2 UEFI-dummy-dev0 UEFI Updates
21:57:59 3 com.via.VL811.firmware VL811 Firmware
21:57:59 4 com.via.VL811+.firmware VL811+ Firmware
21:57:59 5 com.via.VL812.firmware VL812 Firmware
21:57:59 6 com.via.VL812_B2.firmware VL812 B2 Firmware
21:57:59 7 com.dell.uefi124c207d.firmware XPS 15 9550/Precision
5510 System Update
21:57:59 8 com.dell.uefi33773727.firmware XPS 13 9350 System
Update
21:57:59 9 com.dell.uefi43ca3264.firmware OptiPlex 7440 AIO
System Update
21:57:59 10 com.dell.uefia0a3aa54.firmware Embedded Box PC 5000
System Update
21:57:59 11 com.dell.uefiaee2604a.firmware Embedded Box PC 3000
System Update
21:57:59 12 com.dell.uefie0f614ed.firmware Edge Gateway 5000/5100
System Update
21:57:59 13 com.hughski.ColorHug.firmware ColorHug
21:57:59 14 com.hughski.ColorHug2.firmware ColorHug2
21:57:59 15 com.hughski.ColorHugALS.firmware ColorHugALS
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https://bugs.launchpad.net/bugs/1574079
Title:
USB audio device is not recognized after startup in 16.04
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