usb-modeswitch 2.2.1 is not supported by udev (204-5ubuntu20.10) few dongles from huawei {model : EC159} and some other.
By downgrading to udev {204-5ubuntu20.9} its working with those dongles. Kernel version used : 3.14.19 Ubuntu version : 14.04.2 LTS -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1419248 Title: udev-204-5ubuntu20.10 breakes usb_modeswitch Status in systemd package in Ubuntu: Invalid Bug description: usb_modeswitch doesn't work after upgrade from udev-204-5ubuntu20.9 to udev-204-5ubuntu20.10. Downgrading to udev-204-5ubuntu20.9 solves the problem. Kernel: Linux localhost 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:37:48 UTC 2015 i686 i686 i686 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1419248/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp