Public bug reported:

I am using Ubuntu 20.04 on Dell 5575 with AMD Ryzen 5. WiFi was working
during installation and after the I updated recent, it stopped working.

lspci | grep Atheros
03:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network 
Adapter (rev 31)

dmesg errors

[    5.627332]  ath10k_core_register_work+0x26/0x120 [ath10k_core]
[    5.627355] ath10k_pci 0000:03:00.0: unable to get target info from device
[    5.627358] ath10k_pci 0000:03:00.0: could not get target info (-5)
[    5.627373] ath10k_pci 0000:03:00.0: could not probe fw (-5)

have tried using older kernel 5.4.0-26 but that didn't help.

I had to add this to grub, "nomodeset iommu=off" as it wasn't booting.

sudo lspci -vnvn > lspci-vnvn.log
pcilib: sysfs_read_vpd: read failed: Input/output error

lsb_release -rd
Description:    Ubuntu 20.04 LTS
Release:        20.04

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1887622

Title:
  Atheros QCA9377 WiFi Not detected on Ubuntu 20.04

Status in linux package in Ubuntu:
  New

Bug description:
  I am using Ubuntu 20.04 on Dell 5575 with AMD Ryzen 5. WiFi was
  working during installation and after the I updated recent, it stopped
  working.

  lspci | grep Atheros
  03:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless 
Network Adapter (rev 31)

  dmesg errors

  [    5.627332]  ath10k_core_register_work+0x26/0x120 [ath10k_core]
  [    5.627355] ath10k_pci 0000:03:00.0: unable to get target info from device
  [    5.627358] ath10k_pci 0000:03:00.0: could not get target info (-5)
  [    5.627373] ath10k_pci 0000:03:00.0: could not probe fw (-5)

  have tried using older kernel 5.4.0-26 but that didn't help.

  I had to add this to grub, "nomodeset iommu=off" as it wasn't booting.

  sudo lspci -vnvn > lspci-vnvn.log
  pcilib: sysfs_read_vpd: read failed: Input/output error

  lsb_release -rd
  Description:  Ubuntu 20.04 LTS
  Release:      20.04

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