kvm - install proxmox from usb device error -

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i try install proxmox using usb, , when click install, see next error:

testing cdrom /dev/sr0 umount: can't umount /mnt: invalid argument testing again in 5 seconds

finally:

no cdrom found - unable continue (type exit or ctrl-d reboot)

i prepare usb using imageusb in windows, , have previous fail, try prepare in ubuntu using "dd if=pve-cd.iso of=/dev/xyz bs=1m", don't know problem.


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