[09:30] <xnox> realtime-neil:  you are missing
[09:30] <xnox> d-i partman-lvm/device_remove_lvm boolean true
[09:30] <xnox> d-i partman-md/device_remove_md boolean true
[09:30] <xnox> d-i partman-lvm/confirm boolean true
[09:30] <xnox> d-i partman-lvm/confirm_nooverwrite boolean true
[09:31] <xnox> realtime-neil:  to clear left over lvm & mdadm, if any. And even then there are cases it might not be able to remove lvm if there is any on target disks.
[11:40] <realtime-neil> xnox: I stand corrected; thank you.
[13:10] <realtime-neil> xnox: that's what saved me --- I was never attempting to install to media with extant lvm headers. If I had, then I expect I would have seen the d-i flaws you called out.
[19:43] <realtime-neil> Why does my attempt to build ubuntu-cdimage (https://paste.ubuntu.com/p/SPWD9S9kjR/) cause a browser window to open login.launchpad.net ?
[19:48] <realtime-neil> And why, after allowing an authorized application with the same name as my host, does nothing happen when I attempt to build ubuntu-cdimage subsequently?