I am in the same situation, upload the dmesg log
dmesg | grep iwlwifi
** Attachment added: "error-iwlwifi.txt"
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2109343/+attachment/5881331/+files/error-iwlwifi.txt
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Public bug reported:
On upgrade to 18.04 development branch
ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: mate-icon-theme 1.18.2-1
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.8-0ubuntu5
Architecture: amd64
Date: W
