Public bug reported:

Briefly:
The ubuntu 20.04 installer writes things to disk before the "security prompt" 
is issued, and without notifying the user, causing massive data loss.
To reproduce:
- During installation select one volume as "physical volume for encryption" 
(One that already is a LUKS volume. For example one from an identical install 
made minutes earlier).
- press "back"
- advance, and select the same volume as physical volume for encryptiona gain 
- A popup will appear (which did not appear the first time) "an error occurred 
while configuring encrypted volumes - the configuration has been aborted"
- Cancel installation
- Realize that changes were written to disk, and the original LUKS volume is 
now inacessible, and all data is lost, even though you never pressed "continue" 
and never agreed to write any changes to disk


I first posted this here, but it is clearly reproducible
https://askubuntu.com/questions/1304307/luks-encrypted-disk-gives-error-wrong-fs-type-bad-option-bad-superblock-on

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1909821

Title:
  During installation error "An error occurred while configuring
  encrypted" causes data loss

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