Adding a minor mention in the LP Bug, as we had a customer being
affected by the issue while installing 20.04.1 on a z14, atop of z/VM
6.4, using unformatted 3390-M9s.

The workaround provided by Herr Heimes on LP Bug #1878596, Comment #21,
has proven to be a workaround for the issue.

I believe we should either check for the current format of the disk on
z/VM (that's not filesystem formatting, as Heimes pointed out, but
rather a low-level format of the ECKD to be used) using lszdev/lsdasd
then use dasdfmt, or point out in the docs we should have someone run
CPFMTXA in z/VM to add CDL to the DASD, enabling its usage by the Guest.

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Title:
  [Ubuntu 20.04] - Install - problem

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