USB seems to be broken on the 64-bit version. I get numerous USB errors:
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[ 2.155634] usb 1-1: device descriptor read/64, error 18
[ 2.403308] usb 1-1: new high-speed USB device number 3 using xhci_hcd
[ 2.555566] usb 1-1: device descriptor read/64, error 18
[ 2.799561] usb 1-1: device descriptor read/64, error 18
[ 2.915465] usb usb1-port1: attempt power cycle
[ 3.595305] usb 1-1: new high-speed USB device number 4 using xhci_hcd
[ 3.731594] usb 1-1: device descriptor read/64, error 18
[ 3.979560] usb 1-1: device descriptor read/64, error 18
[ 4.247356] usb 1-1: new high-speed USB device number 5 using xhci_hcd
[ 4.383598] usb 1-1: device descriptor read/64, error 18
[ 4.576290] usb_phy_generic phy: phy supply vcc not found, using dummy regulator
[ 4.623951] usb 1-1: device descriptor read/64, error 18
[ 4.739511] usb usb1-port1: unable to enumerate USB device
[ 4.871762] usb 2-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[ 4.899760] usb 2-2: device descriptor read/8, error -61
[ 5.011382] usb 2-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[ 5.035737] usb 2-2: device descriptor read/8, error -61
[ 5.375695] usb 2-2: new SuperSpeed Gen 1 USB device number 3 using xhci_hcd
[ 5.400176] usb 2-2: device descriptor read/8, error -61
[ 5.515784] usb 2-2: new SuperSpeed Gen 1 USB device number 3 using xhci_hcd
[ 5.547826] usb 2-2: device descriptor read/8, error -61
[ 5.687470] usb usb2-port2: attempt power cycle
[ 6.135637] usb 2-2: new SuperSpeed Gen 1 USB device number 4 using xhci_hcd
[ 6.159693] usb 2-2: device descriptor read/8, error -61
[ 6.271306] usb 2-2: new SuperSpeed Gen 1 USB device number 4 using xhci_hcd
[ 6.291672] usb 2-2: device descriptor read/8, error -61
[ 6.627634] usb 2-2: new SuperSpeed Gen 1 USB device number 5 using xhci_hcd
[ 6.651696] usb 2-2: device descriptor read/8, error -61
[ 6.763306] usb 2-2: new SuperSpeed Gen 1 USB device number 5 using xhci_hcd
[ 6.787706] usb 2-2: device descriptor read/8, error -61
[ 6.927429] usb usb2-port2: unable to enumerate USB device
[ 12.580450] usbcore: registered new interface driver brcmfmac
Note that this is an *official* build of Ubuntu 19.10 Server, so it will get fixed at some point. It would have been nice if Canonical had provided Pi-specific release notes, or a link to a forum where we could get more info. They've basically thrown it over the wall and said "here you go".