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I believe that your device uses the Qu- and Quz-series of firmware blobs, not the 9000- or 9260-series; reference: https://bugs.launchpad.net/hwe-next/+bug/1833065 at comment #4. I believe that the later linux-firmware version 1.183 contains the referenced 48.xx versions. Please install it: wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/...


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Disabling WiFi power management solved this problem for me. In the file /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf, I changed it to look like this: [connection] wifi.powersave = 2 Restart NetworkManager (sudo systemctl restart NetworkManager) and it should be go to go.


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As James Reid says: this has been fixed with the latest 5.0 kernel. Now we have Ubuntu 18.04.3 with 5.0.0-31 kernel. Just run: sudo apt-get update && sudo apt-get dist-upgrade -y to get the last kernel version.


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