Reading a bit more code....
ubiquity has partman/check.d/partition_too_small which does read
/cdrom/casper/filesystem.size (which is 5GiB) and should actually
prevent from successfully contining to install on the installation
media.
Also there is d-i/source/partman-auto/lib/auto-shared.sh
get_auto_disks() which should be skipping /cdrom , ie.
# Skip devices containing the installation medium
[ -e "$dev/installation_medium" ] && continue
# Skip installer disk
$(mount | grep -qF "$device on /cdrom ") && continue
So we need to check that those pieces are working correctly and that
devices smaller than 5GiB are never offered for installation *both* when
they are and are *not* installation media.
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https://bugs.launchpad.net/bugs/1845571
Title:
ubiquity offers installation media as an install target
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