[SOLVED] No Internet on Ubuntu 18.03 after Win 10 BIOS update

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Aug 24, 2019
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EDIT: problem solved. Disabling Secure Boot, which got back up, did the trick.

So I had a laptop service point install Ubuntu 18.03 on my IdeaPad L340 with Win 10 preinstalled to achieve my usual dual boot mode. (I did it myself couple of times, but on this machine the USB installer wouldn't show the "install alongside existing Windows installer" option). I worked great - for a week. Some Lenovo updates kicked in, including a BIOS update and the boot menu disappeared.

I entered BIOS to change boot order and moved Ubuntu to the first spot. That did the trick and the boot menu is back. However, for some bizarre reason, Ubuntu is now disconnected from the Internet, prompting: no WiFi adapter available. (It was the same when I first tried installing Ubuntu on this machine by myself, so the update must have reset something). On Windows 10 WiFi works fine, as I used to on the said Ubuntu. I'm puzzled.

What do I do?
 
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