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I just installed Elementary OS on my Lenovo Yoga.

During install everything worked as expected.

No when I reboot sometimes no networks are found.

To fix this I got to reboot various times.

How can I fix this ?

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This may depend on the wifi adapter and its drivers as suggested by the other answer, or it may be a more broad ubuntu 16.04 buggy thing discussed in this askubuntu question: 16.04 LTS wifi connection issues.

The answer that seems to work for me in elementary is this: https://askubuntu.com/a/768268/47206.

What it says is:

  • Get details of your PCI wireless card by running sudo lshw -class network
  • Get your card model info according to the product line. For something like RTL8723BE PCIe Wireless Network Adapter, the model of the card is RTL8723BE
  • Open or create /etc/pm/config.d/config and add SUSPEND_MODULES="rtl8723be"(replace rtl8723be with your own model number) Then run echo "options rtl8723be fwlps=N" | sudo tee /etc/modprobe.d/rtl8723be.conf and reboot.

If this doesn't work, one can, as an emergency solution, restart the network manager with service network-manager restart. I find it easier to use the command bash -c 'service network-manager restart' with a shortcut or launcher.

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