Thanks. So this keeps looping on apr 09 01:41:57 hostname kernel: usb 1-3: new high-speed USB device number 2 using xhci_hcd apr 09 01:41:57 hostname kernel: usb 1-3: device descriptor read/all, error -110
but doesn't say which kind of device that is as it can't talk to it. Is this a regression in 15.04? You have upgraded this machine for a long time, so you might still have some older kernels around (from 14.04 LTS or 14.10). You might try booting those from the GRUB boot menu and see if that helps? ** Changed in: linux (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1437492 Title: boot stalls on USB detection errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1437492/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs