Comment 0 for bug 1986775

I am unable to upgrade my schroot to 1.6.12-2 because I use sbuild-launchpad-chroot.

Test Case
---------
Start with the previous release of schroot
sudo apt install sbuild-launchpad-chroot
sbuild-launchpad-chroot create -n focal -s focal -a amd64
sudo apt dist-upgrade

What Happens
------------
I get this debconf prompt and the install gets stuck in the partially installed broken state:

Stricter rule on chroot names

│ Due to stricter rules on the name, the chroots listed below are no longer supported. Please rename or remove them before installing a newer version of schroot.
│
│ * chroot:focal-backports+main
│ * chroot:focal-backports+main-source
│ * chroot:focal-backports+multiverse
│ * chroot:focal-backports+multiverse-source
│ * chroot:focal-backports+restricted
│ * chroot:focal-backports+restricted-source
│ * chroot:focal-backports+universe
│ * chroot:focal-backports+universe-source
│ * chroot:focal-proposed+main
│ * chroot:focal-proposed+main-source
│ * chroot:focal-proposed+multiverse
│ * chroot:focal-proposed+multiverse-source
│ * chroot:focal-proposed+restricted
│ * chroot:focal-proposed+restricted-source
│ * chroot:focal-proposed+universe
│ * chroot:focal-proposed+universe-source
│ * chroot:focal-security+main
│ * chroot:focal-security+main-source
│ * chroot:focal-security+multiverse
│ * chroot:focal-security+multiverse-source
│ * chroot:focal-security+restricted
│ * chroot:focal-security+restricted-source
│ * chroot:focal-security+universe
│ * chroot:focal-security+universe-source
│ * chroot:focal-updates+main
│ * chroot:focal-updates+main-source
│ * chroot:focal-updates+multiverse
│ * chroot:focal-updates+multiverse-source
│ * chroot:focal-updates+restricted
│ * chroot:focal-updates+restricted-source
│ * chroot:focal-updates+universe
│ * chroot:focal-updates+universe-source