If after no finished update no wifi in your network mannager, you need:

sudo lshw -C network

*-network UNCLAIMED
description: Network controller
product: RT3290 Wireless 802.11n 1T/1R PCIe
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:f7d10000-f7d1ffff

Fix.

sudo modprobe rt2800pci
sudo echo “modprobe rt2800pci” >> /etc/modules

*-network
description: Wireless interface
product: RT3290 Wireless 802.11n 1T/1R PCIe
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 00
serial: bc:85:56:11:43:e1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rt2800pci driverversion=3.13.0-49-generic firmware=0.37 ip=10.42.0.177 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:f7d10000-f7d1ffff

sudo apt-get update
sudo apt-get upgrade