20.04.3 is around the corner and it will have kernel 5.11 too
(https://ubuntu.com/about/release-cycle)

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https://bugs.launchpad.net/bugs/1938464

Title:
  Ubuntu 20.04.2 Installation fails on ThinkPad X1 Nano

Status in linux package in Ubuntu:
  New

Bug description:
  Issue:
  I've created Ubuntu 20.04.2 bootable USBs (tried two different sticks, and 
created on rufus/windows, etcher/macOS, and on Ubuntu 21.04, all following the 
Ubuntu bootable creation guide).
  With a new ThinkPad X1 Nano, I hit the "errno 5 input/output" error during 
installation.
  This error occurs after all options have been set, like username, password, 
partitioning options, etc., but appears to occur before the disk is actually 
written to.
  Fortunately, this means that I can boot back into my working Ubuntu 21.04 
installation, as I'll go into later.

  Hardware Information:
  - ThinkPad X1 Nano
  - Intel Core i7-1160G7 option
  - 512 GB SSD option
  - non-touch screen option
  - default options otherwise
  - came with Windows 10 Pro 20H2
  - serial number is from January 2021

  Additional Notes:
  - validated the ISO using the checksum and guide provided
  - always choosing the "Erase disk and install" option since I do not wish to 
dual boot
  - same result with secure boot enabled and disabled

  What does work:
  Ubuntu 21.04 installs perfectly fine and works perfectly fine. That's with 
secure boot enabled as well, so I doubt that this is related to secure boot. My 
hunch is that the 20.04.2 kernel is too old for my X1 Nano, and perhaps there 
was a stealth revision to its hardware/firmware since I (anecdotally) see X1 
Nano users installing 20.04.2 LTS perfectly fine. My hope is that Ubuntu 
20.04.03 LTS naturally works, but I'd prefer to install an LTS version as soon 
as possible (such as an Ubuntu 20.04.2.X, if possible).

  Kernel information:
  The installer crashes and goes into an unrecoverable state, so I could not 
gather information on the bootable itself (screen freezes a little, making it 
difficult to send a bug report). However, I can provide the Ubuntu 21.04 
information since it does work.
  - Ubuntu 5.11.0-25.27-generic 5.11.22
  - lspci-vnvn.log (attached)

  Please let me know if you require additional information, and how I
  can help. Thank you in advance.

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