联想Legion Y520双系统Ubuntu 16.04 WiFi故障求助

Hey there, let's dig into this WiFi issue on your Ubuntu 16.04 dual-boot setup. Since you've already tried the common fixes for Lenovo Legion Y520 disconnections and hard block problems, let's walk through some more targeted troubleshooting steps:

1. Get Exact WiFi Adapter Details #

First, we need to know exactly what wireless hardware you're working with—this is key to finding the right driver match. Run these commands in the terminal and share the output:

• lspci -nn | grep -i network (shows PCI-based WiFi adapter info)
• rfkill list all (double-checks for any hidden soft/hard blocks we might have missed)
• uname -r (tells us your current kernel version, which affects driver compatibility)

2. Install Updated Drivers for Common Legion Y520 Adapters #

Lenovo Legion Y520 often uses Realtek adapters like RTL8821CE or RTL8822BE, which don't play well with Ubuntu 16.04's default drivers. Here's how to install a compatible DKMS driver (you'll need your Ethernet connection for this):

sudo add-apt-repository ppa:kelebek333/kablosuz
sudo apt update
sudo apt install rtl8821ce-dkms

Reboot your system after installation, then check if WiFi appears in the network menu.

3. Disable Secure Boot (Critical for Dual Boot) #

Most Lenovo laptops have Secure Boot enabled by default, which blocks unsigned third-party drivers (like the one we just installed). To fix this:

• Restart your laptop and enter BIOS/UEFI (press F2, F10, or Del during boot—check your laptop's splash screen for the correct key)
• Navigate to the Security tab and find the "Secure Boot" option
• Set it to Disabled
• Save changes (usually F10) and boot back into Ubuntu

4. Reset Network Manager to Default Settings #

Dual-boot setups can sometimes corrupt Network Manager configurations. Reset it with these commands:

sudo service network-manager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start

After running this, click the network icon in the top bar and see if WiFi networks show up.

5. Test with a Newer Ubuntu Live USB #

Ubuntu 16.04 is end-of-life, so its kernel and driver libraries are outdated. Grab a live USB of Ubuntu 20.04 or 22.04 (LTS versions), boot from it, and check if WiFi works. If it does, upgrading your Ubuntu installation will likely resolve the issue long-term.

内容的提问来源于stack exchange，提问作者Sukrit