[Bug 1881932] [NEW] subiquity isn't able to create btrfs subvolumes during installation

[Gannet]

Public bug reported:

I always use my system on two btrfs subvolumes: @ and @home. And it
worked until 20.04 came out with no Debian installer but with new
unusable subiquity one which is not creates btrfs subvolumes if I chose
/ as a mount point on btrfs. Instead of it says: "Mounting an existing
filesystem at / is usually a bad idea, proceed only with caution" which
is quite strange in my case. How should I install 20.04 on btrfs with
two subvolumes?

** Affects: subiquity
     Importance: Undecided
         Status: New


** Tags: focal

** Also affects: subiquity (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: subiquity (Ubuntu)

** Tags added: focal

** Tags added: subiquity

** Tags added: wos

** Tags removed: subiquity wos

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https://bugs.launchpad.net/bugs/1881932

Title:
  subiquity isn't able to create btrfs subvolumes during installation

Status in subiquity:
  New

Bug description:
  I always use my system on two btrfs subvolumes: @ and @home. And it
  worked until 20.04 came out with no Debian installer but with new
  unusable subiquity one which is not creates btrfs subvolumes if I
  chose / as a mount point on btrfs. Instead of it says: "Mounting an
  existing filesystem at / is usually a bad idea, proceed only with
  caution" which is quite strange in my case. How should I install 20.04
  on btrfs with two subvolumes?

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