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Here are my travels getting QCA9377/ath10k working with Ubuntu 18.04 LTS.

The system needs both the driver and the firmware.

$lspci
02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)

$ sudo dmesg | grep ath10k
[ 23.189587] ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 23.497366] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:02:00.0.bin failed with error -2
[ 23.497373] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/cal-pci-0000:02:00.0.bin failed with error -2
[ 23.553780] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA9377/hw1.0/firmware-6.bin failed with error -2
[ 23.725428] ath10k_pci 0000:02:00.0: qca9377 hw1.1 target 0x05020001 chip_id 0x003821ff sub 17aa:0901
[ 23.725429] ath10k_pci 0000:02:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
[ 23.725786] ath10k_pci 0000:02:00.0: firmware ver WLAN.TF.1.0-00002-QCATFSWPZ-5 api 5 features ignore-otp crc32 c3e0d04f
[ 23.823833] ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 8aedfa4a
[ 24.455129] ath10k_pci 0000:02:00.0: htt-ver 3.44 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[ 25.139469] ath10k_pci 0000:02:00.0 wlp2s0: renamed from wlan0

https://www.dell.com/support/article/en-us/sln306440/killer-n1535-wireless-firmware-manual-update-guide-for-ubuntu-systems?lang=en

$cd /lib/firmware/ath10k/QCA9377/HW1
$cp WLAN.TF.2.1/firmware-6.bin_WLAN.TF.2.1-00016 firmware-6.bin
(Be sure to use the higher/newest firmware number)

$dmesg | grep -i "error\|warn\|fail"
[ 1.162573] RAS: Correctable Errors collector initialized.
[ 7.807736] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro
[ 23.497366] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:02:00.0.bin failed with error -2
[ 23.497373] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/cal-pci-0000:02:00.0.bin failed with error -2
[ 23.553780] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA9377/hw1.0/firmware-6.bin failed with error -2

$ uname -r
4.15.0-99-generic

$sudo apt-get update
$sudo apt-get upgrade
$sudo apt-get dist-upgrade

$sudo nmcli dev wifi list

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic

# v18.04.4 has a newer kernel but it is not installed automatically on LTS.
# Let's install the newer kernel:
$sudo apt install --install-recommends linux-generic-hwe-18.04 xserver-xorg-hwe-18.04

$ uname -r
5.3.0-51-generic