After upgrading from 16.04 to 16.10 I'm now seeing this issue. Removing brltty was a fix for my system. Below were the results before removing brltty:
:~/Desktop$ dmesg | grep tty [ 0.000000] console [tty0] enabled [ 1.222490] 00:06: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A [ 5.862329] usb 4-3: cp210x converter now attached to ttyUSB0 [ 8.030587] usb 4-3: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1 [ 8.032694] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 [ 804.989176] usb 5-5: usbfs: USBDEVFS_CONTROL failed cmd brltty rqt 128 rq 6 len 255 ret -62 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/874181 Title: brltty daemon prevents creation of ttyUSB0 device link To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/874181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
