Here is output for lspci -v | grep -A 10 -i "Network Controller":
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02:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
Subsystem: Intel Corporation Dual Band Wireless-AC 8265
Flags: fast devsel, IRQ 255
Memory at ee200000 (64-bit, non-prefetchable) [disabled] [size=8K]
Capabilities: <access denied>
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iwlwifi-8265-ucode-22.361476.0
I followed the instructions on this post: viewtopic.php?t=247531
and ran
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sudo cp iwlwifi-8265-22.ucode /lib/firmware/
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sudo apt-get install build-essential linux-headers-$(uname -r)
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Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-headers-4.15.0-20-generic
E: Couldn't find any package by glob 'linux-headers-4.15.0-20-generic'
E: Couldn't find any package by regex 'linux-headers-4.15.0-20-generic'
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(Reading database ... 317506 files and directories currently installed.)
Preparing to unpack linux-headers-4.15.0-20-generic_4.15.0-20.21~16.04.1_amd64.deb ...
Unpacking linux-headers-4.15.0-20-generic (4.15.0-20.21~16.04.1) over (4.15.0-20.21~16.04.1) ...
Setting up linux-headers-4.15.0-20-generic (4.15.0-20.21~16.04.1) ...
/etc/kernel/header_postinst.d/dkms:
ERROR (dkms apport): kernel package linux-headers-4.15.0-20-generic is not supported
Error! Bad return status for module build on kernel: 4.15.0-20-generic (x86_64)
Consult /var/lib/dkms/ndiswrapper/1.60/build/make.log for more information.
I am now burned out from trying to find a solution on my own. Can someone help me figure this out? Thank you.