I saw the exact same messages when running bionic installed through
latest cdimage builds of ubuntu. It's visible on boot almost every time
(although once I noticed it was not present in the boot logs and dmesg,
so it might not be reproducible 100% of the time).

I tried the latest mainline kernel, in this case: 4.15.0-041500rc8 and the 
issue seems to still be present (output still there). Confirmed I'm running the 
4.15 kernel.
Please note my testing environment is a standard kvm instance.

Tagging.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1740289

Title:
  print_req_error: critical target error, dev sr0, sector 2097136

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