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I tried tomodprobe usb-storage and modprobe scsi_mod but it not working,and I try to use tail -f /var/log/syslog and got this:

Oct 21 15:48:30 Raspi kernel: [  815.178786] usb usb2-port1: attempt power cycle
Oct 21 15:48:31 Raspi kernel: [  816.106888] usb 2-1: new SuperSpeed Gen 1 USB device number 12 using xhci_hcd
Oct 21 15:48:31 Raspi kernel: [  816.127630] usb 2-1: device descriptor read/8, error -61
Oct 21 15:48:31 Raspi kernel: [  816.238625] usb 2-1: new SuperSpeed Gen 1 USB device number 12 using xhci_hcd
Oct 21 15:48:31 Raspi kernel: [  816.259615] usb 2-1: device descriptor read/8, error -61
Oct 21 15:48:32 Raspi kernel: [  816.594824] usb 2-1: new SuperSpeed Gen 1 USB device number 13 using xhci_hcd
Oct 21 15:48:32 Raspi kernel: [  816.615660] usb 2-1: device descriptor read/8, error -61
Oct 21 15:48:32 Raspi kernel: [  816.726625] usb 2-1: new SuperSpeed Gen 1 USB device number 13 using xhci_hcd
Oct 21 15:48:32 Raspi kernel: [  816.747639] usb 2-1: device descriptor read/8, error -61
Oct 21 15:48:32 Raspi kernel: [  816.886805] usb usb2-port1: unable to enumerate USB device
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The Raspberry Pi 4B is not supported under Ubuntu 19.04 (Disco). The first version with 4B support is Ubuntu 19.10 (Eoan), though I'm hoping to get support back-ported to the current LTS (18.04, Bionic) as soon as possible.

If you have a 19.04 installation and wish to upgrade, that upgrade should be performed on a platform supported by 19.04, e.g. a Raspberry Pi 3B. After upgrade, the image should be bootable on a 4B; if it is not, that's a bug - please let me know!

However, be aware there is currently a known issue with the USB ports under the arm64 image on the Raspberry Pi 4B:

USB not working under arm64 on Pi4

A workaround is mentioned in that report, but you may wish to stick to the armhf variant for now (armhf uses LPAE, so you'll still have access to all the RAM on the Pi4).

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  • Thanks, it's my mistake, actually the ubuntu server version is 19.10, and I got the same problem on usb, thank you for your help – ZhiYao Wang Oct 25 '19 at 19:26

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