wireless - Can't connect to wifi after update - Ask Ubuntu

this question has answer here:

• why “required key not available” when install 3rd party kernel modules or after kernel upgrade? 4 answers

on ubuntu 16.04.
when run lspci -nnk | grep -ia2 net get:

01:00.0 ethernet controller [0200]: realtek semiconductor co., ltd. rtl8111/8168/8411 pci express gigabit ethernet controller [10ec:8168] (rev 15)     subsystem: lenovo rtl8111/8168/8411 pci express gigabit ethernet controller [17aa:383a]     kernel driver in use: r8169     kernel modules: r8169 02:00.0 network controller [0280]: qualcomm atheros device [168c:0042] (rev 30)     subsystem: lenovo device [17aa:4035]     kernel modules: ath10k_pci  $ rfkill list 0: ideapad_wlan: wireless lan     soft blocked: no     hard blocked: no 1: ideapad_bluetooth: bluetooth     soft blocked: no     hard blocked: no 2: hci0: bluetooth     soft blocked: no     hard blocked: no 

as requested:

$ uname -a; dmesg | grep ath linux yinon 4.4.0-45-generic #66-ubuntu smp wed oct 19 14:12:37 utc 2016 x86_64 x86_64 x86_64 gnu/linux 

edditional edit:

$ sudo modprobe ath10k_pci modprobe: error: not insert 'ath10k_pci': required key not available $ dmesg | grep ath [    1.509368]  [<ffffffff81081212>] warn_slowpath_common+0x82/0xc0 [    1.509370]  [<ffffffff810812ac>] warn_slowpath_fmt+0x5c/0x80 

ethernet works good.
how can find out wrong?

this seems general solution 168c:0042 device issues, although hasn't worked me:

update device firmware:

wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.161_all.deb  sudo dpkg -i linux-firmware*.deb 

after update, reboot , let know results