I just followed https://askubuntu.com/questions/311622/downgrading-iwlwifi
for Intel 7260 using -17 ucode. However, the rmmod iwldvm && rmmod iwlwifi
modprobe iwlwifi && modprobe iwldvm did not work as there is no iwldvm module . 
Could this be the issue or is iwldvm replaced by something else?  I changed 
into /usr/local/lib/firmware, using sudo for all operations, and after iwldvm 
failed I did the rmmod iwlwifi followed by modprobe iwlwifi but this did not 
activate the Intel 7260.   Was there a change between Ubuntu 20.04LTS and 
22.04LTS (e.g., a different kernel and kernel support systems)?

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https://bugs.launchpad.net/bugs/1971065

Title:
  22.04LTS firmware does not work for an iwlwifi 802.11 interface that
  did work under 20.04LTS

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I just updated in place (no new harddrive, no new partitions) from 20.04LTS 
to 22.04LTS.  Everything worked except that there is a firmware loading 
diagnostic (along with a separate failure to compile the VMWare kernel support 
-- but that may be a VMWare issue, not Ubuntu).  Thus, the 802.11 hardware is 
NOT "seen" by the kernel, etc.  (I am using bluetooth to Android phone to our 
802.11 network to get to the Internet right now -- not the laptop 802.11).  The 
relevant section of the dmesg log seems to be: [   30.805966] kernel: iwlwifi 
0000:3d:00.0: Failed to load firmware chunk!
  [   30.814167] kernel: iwlwifi 0000:3d:00.0: iwlwifi transaction failed, 
dumping registers
  [   30.831295] kernel: iwlwifi 0000:3d:00.0: iwlwifi device config registers:
  [   30.841152] kernel: iwlwifi 0000:3d:00.0: 00000000: 08b18086 00100406 
0280006b 00000010 d0100004 00000000 00000000 00000000
  [   30.858325] kernel: iwlwifi 0000:3d:00.0: 00000020: 00000000 00000000 
00000000 c0708086 00000000 000000c8 00000000 00000100
  [   30.873937] kernel: iwlwifi 0000:3d:00.0: 00000040: 00020010 10008ec0 
00130c10 0106ec11 101100ca 00000000 00000000 00000000
  [   30.888621] kernel: iwlwifi 0000:3d:00.0: 00000060: 00000000 00080812 
00000405 00000000 00010001 00000000 00000000 00000000
  [   30.903224] kernel: iwlwifi 0000:3d:00.0: 00000080: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
  [   30.918557] kernel: iwlwifi 0000:3d:00.0: 000000a0: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
  [   30.934480] kernel: iwlwifi 0000:3d:00.0: 000000c0: 00000000 00000000 
c823d001 0d000000 00814005 fee003f8 00000000 00000000
  [   30.951475] kernel: iwlwifi 0000:3d:00.0: 000000e0: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
  [   30.969958] kernel: iwlwifi 0000:3d:00.0: 00000100: 14010001 00004000 
00000000 00462031 00002000 00002000 0000000e 00000000
  [   30.989997] kernel: iwlwifi 0000:3d:00.0: 00000120: 00000000 00000000 
0000000

  and more.  The machine is a HP Zbook G2 that had no issues with Ubuntu
  20.04LTS.   Any help would be appreciated.  Would it work to downgrade
  the firmware .deb to 20.04LTS or would this be not compatible with the
  current 22.04LTS production kernel or environment.  If downgrading
  would work, please provide "detailed" instructions (e.g., the apt
  command invocations to use).

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