ubsseri al

 4210.332765] firefox:1506 freeing invalid memtype f82f2000-f82f6000
[ 4210.332782] firefox:1506 freeing invalid memtype f82f6000-f82fa000
[ 4210.332800] firefox:1506 freeing invalid memtype f82fa000-f82fe000
[ 4210.332816] firefox:1506 freeing invalid memtype f82fe000-f8302000
[ 5211.392088] usb 2-1: USB disconnect, device number 2
[ 5227.264078] usb 2-1: new full speed USB device number 3 using uhci_hcd
[ 5229.873005] cdc_acm 2-1:1.0: ttyACM0: USB ACM device
[ 5344.568094] usb 2-1: USB disconnect, device number 3
[ 5391.944030] usb 2-2: new full speed USB device number 4 using uhci_hcd
[ 5392.248030] usb 2-2: device descriptor read/64, error -71
[ 5392.416069] hub 2-0:1.0: unable to enumerate USB device on port 2
[ 5393.168031] usb 2-2: new full speed USB device number 5 using uhci_hcd
[ 5393.288028] usb 2-2: device descriptor read/64, error -71
[ 5393.512029] usb 2-2: device descriptor read/64, error -71
[ 5393.728033] usb 2-2: new full speed USB device number 6 using uhci_hcd
[ 5393.848028] usb 2-2: device descriptor read/64, error -71
[ 5394.072050] usb 2-2: device descriptor read/64, error -71
[ 5394.288026] usb 2-2: new full speed USB device number 7 using uhci_hcd
[ 5394.696069] usb 2-2: device not accepting address 7, error -75
[ 5394.808064] usb 2-2: new full speed USB device number 8 using uhci_hcd
[ 5395.216031] usb 2-2: device not accepting address 8, error -71
[ 5395.216067] hub 2-0:1.0: unable to enumerate USB device on port 2
[ 5415.284066] usb 2-2: new full speed USB device number 9 using uhci_hcd
[ 5417.889090] cdc_acm 2-2:1.0: ttyACM0: USB ACM device
[ 7160.816070] usbcore: registered new interface driver usbserial
[ 7160.816102] USB Serial support registered for generic
[ 7160.816136] usbcore: registered new interface driver usbserial_generic
[ 7160.816140] usbserial: USB Serial Driver core
user1@lubuntu:~$