ubuntu 17.10 or .04 wifi not work problem fix record (for lenovo y520 series only)

sudo tee /etc/modprobe.d/ideapad.conf <<< "blacklist ideapad_laptop"

there's a bug from bios for wifi hard control, so disabled it.

reboot, should be fixed.

if still won't work try below

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intel firmware

https://www.intel.com.tw/content/www/tw/zh/support/articles/000005511/network-and-i-o/wireless-networking.html

check your kernel loaded which version of .ucode loaded

e.g. firmware:       iwlwifi-8265-33.ucode

rename your firmware download from intel

e.g. iwlwifi-8265-22.ucode --> iwlwifi-8265-33.ucode

if you see

##### dmesg #############################

[   11.497331] iwlwifi 0000:02:00.0: loaded firmware version 22.391740.0 op_mode iwlmvm
[   11.568429] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8265, REV=0x230
[   11.623114] iwlwifi 0000:02:00.0: base HW address: <MAC 'wlp2s0' [IF2]>
[   11.777241] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[   12.082906] iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0

means successful