Thanks for your feedback Eero, I have tested USB 2/3 drives on USB 2/3 hubs now - it is not that in in general a combo of these would fail.
Lets continue to brainstorm what could be the issue ... I hear from you that your Failing Device is the "Porsche Design Desktop Drive" and that you say is USB 2.0 in comment #6. But your error thinks it is USB 3.0, maybe there is an issue around that being correctly detected?: Warning: speed mismatch trying to attach usb device "Porsche Desktop" (super speed) to bus "usb.0", port "1" (full+high speed) Super Speed = USB 3 What does "sudo lsusb -v -d 059f:106e" on the host show? Does the host detect it as USB 2 or 3? --- Further we might want/need to focus on the actual error being "failed to open host usb device 2:2", but you said there are no apparmor Denies anymore. So why is it failing then? Not recommended in general, but for a try you might set the user your guests are executed at to root to check if this might be a "normal" ownership/permission issue of some of your device nodes vs the libvirt-qemu user that you have. See configs user/group in /etc/libvirt/qemu.conf I'd never keep it that way, but it is sometimes the easiest way to check for permission issues. Furthermore you might check the group memberships of libvirt-qemu: $ id libvirt-qemu --- Finally I really want to know which access exactly is failing. After the guest is up (without the USB device yet). Set up an strace to the open calls like: $ sudo strace -e 'trace=/.*open.*' -p <PID-of-qmeu> Then in the UI hit the "attach USB" and report what was traced And just to be sure - check dmesg once more if there really is not Denial. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815588 Title: speed mismatch trying to attach usb device to guest vm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1815588/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
