For ubuntu 14.10 after small changes in code downloaded from mediatek site wifi work.
/rt2x00/rt2800usb.c
line 766 PREPARE_WORK(&rt2x00dev->txdone_work, rt2800usb_work_txdone); ---> INIT_WORK(&rt2x00dev->txdone_work, rt2800usb_work_txdone);
For ubuntu 14.10 after small changes in code downloaded from mediatek site wifi work.
/rt2x00/ rt2800usb. c
line 766 PREPARE_ WORK(&rt2x00dev ->txdone_ work, rt2800usb_ work_txdone) ; &rt2x00dev- >txdone_ work, rt2800usb_ work_txdone) ;
---> INIT_WORK(