Is this still an issue?

1. I do not see Failed to begin udev enumeration.

2. In about:usb-internals I see my mouse and webcam.

3. The Chromium's Apparmor profile has all these:

--->
/run/udev/data/c116:[0-9]* r,
/run/udev/data/+sound:card[0-9]* r,
/run/udev/data/c16[67]:[0-9] r, # ACM USB modems
/run/udev/data/b180:*    r, # various USB block devices
/run/udev/data/c18[089]:* r, # various USB character devices: USB serial 
converters, etc.
/run/udev/data/+usb:* r,
/run/udev/data/c13:{[0-9],[12][0-9],3[01]} r,
/run/udev/data/c13:{6[5-9],[7-9][0-9],[1-9][0-9][0-9]*} r,
/run/udev/data/c23[4-9]:* r,
/run/udev/data/c24[0-9]:* r,
/run/udev/data/c25[0-4]:* r,
/run/udev/data/+power_supply:hid* r,
/run/udev/data/c14:[0-9]* r,
/run/udev/data/c13:[0-9]* r,
/run/udev/data/+input:* r,
/run/udev/data/+drm:card* r,
/run/udev/data/+pci:[0-9a-f]* r,
/run/udev/data/+platform:soc:gpu* r,
# /run/udev/data/<type><major>:<minor> r,
/run/udev/data/c226:[0-9]* r,  # 226 drm
/run/udev/data/c13:[0-9]* r,
/run/udev/data/+input:* r,
/run/udev/data/+platform:* r,
/run/udev/data/+power_supply:* r,
/run/udev/data/** r,
# Various files in /run/udev/data needed by Chrome Settings. Leaks device
/run/udev/data/c1:[0-9]* r,   # /dev/psaux
/run/udev/data/c10:[0-9]* r,  # /dev/adbmouse
/run/udev/data/c13:[0-9]* r,  # /dev/input/*
/run/udev/data/c180:[0-9]* r, # /dev/vrbuttons
/run/udev/data/c4:[0-9]* r,   # /dev/tty*, /dev/ttyS*
/run/udev/data/c5:[0-9]* r,   # /dev/tty, /dev/console, etc
/run/udev/data/c7:[0-9]* r,   # /dev/vcs*
/run/udev/data/+hid:* r,
/run/udev/data/+input:input[0-9]* r,
/run/udev/data/c29:[0-9]* r,  # /dev/fb*
/run/udev/data/+backlight:* r,
/run/udev/data/+leds:* r,
/run/udev/data/c116:[0-9]* r, # alsa
/run/udev/data/+sound:card[0-9]* r,
/run/udev/data/c108:[0-9]* r, # /dev/ppp
/run/udev/data/c189:[0-9]* r, # USB serial converters
/run/udev/data/c89:[0-9]* r,  # /dev/i2c-*
/run/udev/data/c81:[0-9]* r,  # video4linux (/dev/video*, etc)
/run/udev/data/c202:[0-9]* r, # /dev/cpu/*/msr
/run/udev/data/c203:[0-9]* r, # /dev/cuse
/run/udev/data/+acpi:* r,
/run/udev/data/+hwmon:hwmon[0-9]* r,
/run/udev/data/+i2c:* r,
/run/udev/data/n[0-9]* r,
/run/udev/data/+bluetooth:hci[0-9]* r,
/run/udev/data/+rfkill:rfkill[0-9]* r,
/run/udev/data/c241:[0-9]* r, # /dev/vhost-vsock
/run/udev/data/b1:[0-9]* r,   # /dev/ram*
/run/udev/data/b7:[0-9]* r,   # /dev/loop*
/run/udev/data/b8:[0-9]* r,   # /dev/sd*
/run/udev/data/b11:[0-9]* r,  # /dev/scd* and sr*
/run/udev/data/b230:[0-9]* r, # /dev/zvol*
/run/udev/data/c21:[0-9]* r,  # /dev/sg*
/run/udev/data/+usb:[0-9]* r,
/run/udev/data/b252:[0-9]* r,
/run/udev/data/b253:[0-9]* r,
/run/udev/data/b259:[0-9]* r,
/run/udev/data/c24[0-9]:[0-9]* r,
/run/udev/data/c25[0-4]:[0-9]* r,
/run/udev/data/c81:[0-9]* r, # video4linux (/dev/video*, etc)
/run/udev/data/+usb:* r,
<---

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https://bugs.launchpad.net/bugs/1905458

Title:
  [snap] Chromium USB enumeration fails when usbmon module is loaded

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