Comment 28 for bug 1864787

I've attempted to re-look at this, see https://discourse.lubuntu.me/t/exploration-of-lp-1864787-sfdisk-force-append-dev-sda/2074/4

but in summary (same sda8 & sda9 partitions, I didn't try any BTRFS, only using ext4, replacing with new ext4 for /)

- hirsute installed on d755-5 twice without issue (http://iso.qa.ubuntu.com/qatracker/milestones/419/builds/225461/testcases/1701/results/)

- focal installed on d755-5 once successfully without this issue (http://iso.qa.ubuntu.com/qatracker/milestones/408/builds/225460/testcases/1701/results/)

- focal installed a second time (different daily ISO) again without issue (http://iso.qa.ubuntu.com/qatracker/milestones/408/builds/225688/testcases/1701/results/)

I'll endeavour to repeat the install on occasion
Re-reading the original issue, the primary thing I notice missing is I was only used EXT4.. no BTRFS or XFS was used in these tests